Debt Instrument, Covenant, Leverage Ratio, Maximum allowed

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- Definition

Debt Instrument, Covenant, Leverage Ratio, Temporary Maximum

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- Definition

Debt, Issuance Price, Percentage of Face Value

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Debt and Lines of Credit (Details) $ in Millions				9 Months Ended		12 Months Ended
Debt and Lines of Credit (Details) $ in Millions	May 08, 2026 USD ($)	Jun. 30, 2022 USD ($)	Nov. 10, 2020 USD ($)	May 31, 2026 USD ($)	May 31, 2025 USD ($)	Aug. 31, 2025 USD ($)	Nov. 25, 2024 USD ($)
Debt Instrument [Line Items]
Borrowings from term loan				$ 0.0	$ 600.0
Letters of Credit
Debt Instrument [Line Items]
Outstanding letters of credit				7.2
2.150% Senior Unsecured Notes Due December 2030 \| Unsecured Debt \| Acuity Brands Lighting, Inc.
Debt Instrument [Line Items]
Aggregate principal amount			$ 500.0
Interest rate (as percent)			2.15%
Debt issuance price as a percentage of face value (as percent)			99.737%
Deferred issuance costs			$ 4.8
Term of instrument (in years)			10 years
Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Long-term debt				$ 200.0
Debt instrument, covenant, leverage ratio, maximum				3.75
Debt instrument, covenant, leverage ratio, temporary maximum				4.25
Additional borrowing capacity under revolving credit facility				$ 592.8
Credit Agreement \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Term of instrument (in years)	5 years
Executed revolving credit facility	$ 800.0
Credit Agreement \| Line of Credit \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Applicable margins as determined by leverage ratio or ratings level	0.75%
Credit Agreement \| Line of Credit \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Applicable margins as determined by leverage ratio or ratings level	1.25%
Prior Credit Agreement \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Term of instrument (in years)		5 years
Executed revolving credit facility		$ 600.0
Term Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Executed revolving credit facility							$ 600.0
Repayments of debt	$ 200.0			$ 200.0		$ 200.0
Long-term debt						400.0
Term Loan Facility \| Line of Credit \| QSC, LLC
Debt Instrument [Line Items]
Borrowings from term loan						$ 600.0