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Customer, Refund Liability, Current Other comprehensive income (loss) items: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Asset impairment Asset Impairment Charges Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Litigation Case [Domain] Litigation Case [Domain] Miscellaneous expense (income), net Miscellaneous expense (income), net Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Restructuring Type [Axis] Restructuring Type [Axis] Current Fiscal Year End Date Current Fiscal Year End Date ABL Acuity Brands Lighting and Lighting Controls Segment [Member] Acuity Brands Lighting and Lighting Controls 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