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

No definition available.

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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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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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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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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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Number of share options (or share units) exercised during the current period.

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

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Equity Awards - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Aug. 03, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance						1,425,000
Number of shares available for future grant		1,244,080		1,244,080
Stock option expense		$ 0.5	$ 0.3	$ 0.9	$ 0.6
Aggregate intrinsic value for outstanding options		25.0		25.0
Aggregate intrinsic value for exercisable options		22.9		22.9
Total intrinsic value of options exercised				$ 0.8
Number of Shares, Exercised				(6,003)
Restricted stock or unit expense		$ 5.0	$ 4.6	$ 9.4	$ 8.8
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%
Performance share units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share based compensation expense				$ 17.4
Performance share units [Member] \| Fiscal 2026 Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	29,273
Performance stock options [Member] \| Fiscal 2026 Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	14,712
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 upon 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 2028 (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] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital	20.00%
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%
Fiscal 2026 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		14,712		14,712
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				2 years 2 months 12 days
Unrecognized compensation expense		$ 3.2		$ 3.2
Time Vesting Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant		29,273		29,273
Fiscal 2026 Employee Restricted Stock Unit Time-Vesting Award [Member] \| Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting period				3 years
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 7 months 6 days
Unrecognized compensation expense		$ 27.8		$ 27.8