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ASSETS Assets [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Accounting Policies [Abstract] Accounting Policies [Abstract] $40.01 - $100.00 (average life - 1.9 years) Exercise Price Range One [Member] Exercise Price Range One [Member] Entity Address, State or Province Entity Address, State or Province Accounts payable Accounts Payable, Current Foreign currency translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) The Luminaires Group (TLG) The Luminaires Group (TLG) [Member] The Luminaires Group (TLG) [Member] Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Weighted average useful life of acquired intangible assets Acquired Finite-lived Intangible Assets, Weighted Average Useful 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[Member] Acuity Brands Lighting, Inc. 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Amortization expense in fiscal 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Carrying and estimated fair values of financial instruments Long-term Debt, Fair Value Income tax expense Income Tax Expense (Benefit) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Local Phone Number Local Phone Number Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] 2016 Fixed-rate Bank Loans 2016 Fixed-rate Bank Loans [Member] 2016 Fixed-rate Bank Loans [Member] Upper range of option exercise prices (in usd per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Average life Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Emerging Growth Company Entity Emerging Growth Company Relocation and other restructuring costs Relocation and Other Restructuring Costs [Member] Relocation and Other Restructuring Costs Retail sales Sales Channel, Through Retail [Member] Sales Channel, Through Retail [Member] Executed revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Maximum leverage ratio Line of Credit Facility, Covenant Terms, Leverage Ratio, Maximum Line of Credit Facility, Covenant Terms, Leverage Ratio, Maximum Maximum Maximum [Member] Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Retained Earnings Retained Earnings [Member] Measurement Basis [Axis] Measurement Basis [Axis] Schedule of Net Periodic Pension Cost Schedule of Net Benefit Costs [Table Text Block] Total number of statements challenged in the Consolidated Complaint Loss Contingency, New Claims Filed, Number Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] Award Type [Domain] Interest expense, net Interest expense, net Interest Revenue (Expense), Net Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Trading Symbol Trading Symbol Weighted average exercise price of exercisable shares (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Proceeds from stock option exercises and other Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Payments and other deductions Standard Product Warranty Accrual, Decrease for Payments Treasury stock, at cost — 17,571,980 and 15,012,449 shares, respectively Treasury Stock, Value Earnings per Share Earnings Per Share [Text Block] Pension Plan Pension Plan [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]