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

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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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Stock Option Plans - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Aug. 31, 2023	May 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Aug. 03, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved future issuance						1,425,000
Number of shares available for future grant			1,411,799
Stock option expense			$ 2.0	$ 3.4	$ 3.4
Aggregate intrinsic value for outstanding options			45.6
Aggregate intrinsic value for exercisable options			40.5
Total intrinsic value of options exercised			18.8	4.4	15.7
Restricted stock or unit expense			$ 17.9	$ 13.7	$ 10.9
Options granted			5,558	56,621	11,316
Long Term Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital			20.00%
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%
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] \| 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]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant		2,296
Percentage of average return on invested capital			20.00%
Reduced percentage of shares earned in stock options plan			66.70%
Stock based compensation plan, description			The performance criterion for the Fiscal 2024 Employee Performance Stock Option Award was based upon the achievement of certain levels of return on equity (as defined in the option agreements), ranging from 10% to 20%, from the performance periods described below. All stock options in each performance period will be earned if the return on equity is 20% or greater. If the return on equity is less than 20% but at least 10% in any performance period, the amount of stock options earned in such period will be reduced proportionately using straight-line interpolation, such that approximately 66.7% of the amount of stock options granted will be earned if the return on equity is 10%. If the Company does not achieve a return on equity of at least 10% during any performance period, all stock option awards for the performance period will be forfeited.
Share-based compensation award expiration term		10 years
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%
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		1,914
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 10 months 24 days
Unrecognized compensation cost			$ 1.7
Employee Stock Option \| Long Term Compensation Plan [Member] \| Members of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award expiration term	10 years
Options granted	1,348
Performance Vesting Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant		45,693
Percentage of average return on invested capital			20.00%
Stock based compensation plan, description			The performance criterion for the Fiscal 2024 Employee Restricted Stock Performance Award was based upon the achievement of certain levels of return on equity (as defined in the agreement), ranging from 10% to 20%, for the performance periods described below. All stock options in each performance period will be earned if the return on equity is 20% or greater. If the return on equity is less than 20% but at least 10% in any performance period, the amount of stock options earned in such period will be reduced proportionately using straight-line interpolation, such that approximately 66.7% of the amount of stock options granted will be earned if the return on equity is 10%. If the Company does not achieve a return on equity of at least 10% during any performance period, all awards for the period will be forfeited.
Reduced percentage of restricted shares			66.70%
Performance Vesting Restricted Stock [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital		10.00%	10.00%
Performance Vesting Restricted Stock [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of average return on invested capital		20.00%
Time Vesting Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant		38,072
Share-based compensation vesting period		3 years	3 years
Time Vesting Restricted Stock [Member] \| Members of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation vesting period		1 year
Share-based compensation award expiration term		1 year
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant			201,000
Weighted-average period of recognition of unrecognized compensation cost			1 year 4 months 24 days
Unrecognized compensation cost			$ 17.4
Restricted Stock [Member] \| Members of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	10,755