Percentage of average return on invested capital on share based compensation arrangement.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of terms of share-based payment arrangement. Includes, but is not limited to, type of award or grantee and reason for issuance.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Amount of noncash expense for option under share-based payment arrangement.

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Share-Based Employee Compensation - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 31, 2024	May 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	May 31, 2024	Aug. 03, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant			1,342,965		1,342,965
Common Stock, Capital Shares Reserved for Future Issuance								1,425,000
Stock option expense			$ 0.3	$ 0.5	$ 0.6	$ 1.0
Aggregate intrinsic value for outstanding options			45.2		45.2
Aggregate intrinsic value for exercisable options			$ 39.8		39.8
Total intrinsic value of options exercised					$ 4.1
Options granted					5,476
Maximum Performance Level [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Percentage of Target PSA's					200.00%
Threshold Performance Level [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Percentage of Target PSA's					50.00%
Fiscal 2025 Board of Directors Stock Option Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award expiration term	10 years
Options granted	1,550
Fiscal 2025 Board of Directors Restricted Stock Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting period	1 year
Share-based payment award, granted	7,078
Performance share units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share based compensation expense					$ 11.7
Performance share units [Member] \| Fiscal 2025 Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant							29,391
Performance stock options [Member] \| Fiscal 2025 Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant							1,963
Performance Vesting Stock Options [Member] \| Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation plan, description					The performance vesting criteria are based on certain levels of average annual return on equity (as defined in the Performance Stock Award Agreements) ranging from 10.0% to 20.0% measured at the end of fiscal 2027 (three-year performance period) as modified by total stockholder return. Performance outcomes (taking into account both criteria) will result in a threshold vesting percentage of 50% of target and maximum performance will result in a vesting percentage of 200% of target. If the threshold vesting percentage is not achieved, none of the Performance Stock Awards will be earned.
Performance Vesting Stock Options [Member] \| Long Term Compensation Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital		10.00%
Performance Vesting Stock Options [Member] \| Long Term Compensation Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital		20.00%
Fiscal Two Thousand Twenty Five Time Vesting Stock Options [Member] \| Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant			1,963		1,963
Share-based compensation vesting period					3 years
Fiscal Two Thousand Twenty Five Time Vesting Restricted Stock [Member] \| Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting period					3 years
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition of unrecognized compensation cost					1 year 6 months
Unrecognized compensation expense			$ 1.7		$ 1.7
Time Vesting Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant			30,272		30,272
Restricted Stock Units and Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition of unrecognized compensation cost					1 year 8 months 12 days
Restricted stock or unit expense			$ 4.6	$ 3.8	$ 8.8	$ 9.8
Unrecognized compensation expense			$ 28.2		$ 28.2
Share-based payment award, granted					66,741