Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,593,817
Stock options granted	284,109	192,700	169,703
Stock-based compensation expense	$ 2,996	$ 634	$ 2,741
Stock-based compensation expense, net of tax	$ 565	$ 3,251	$ 700
Market price per unit of stock award	$ 58.05	$ 75.32	$ 73.39
Unrecognized compensation expense associated with non-vested incentive awards outstanding	$ 44,633
Nonvested stock, weighted average remaining contractual term	26 months
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 58.05
Stock unit grant during period	342,930
Restricted Shares Restricted Stock Units and Market Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 17,784	$ 19,357	$ 16,712
Stock unit grant during period	1,147	1,441	1,345
Equity-based compensation expense, tax benefit	$ 2,544	$ 3,085	$ 3,325
Non Employee Directors \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted	40,462	35,065	33,408
Market price per unit of stock award	$ 39.74	$ 46.30	$ 46.24
Management \| Nonqualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	284,109
Vesting period, in years	3 years
Management \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 57.75	$ 75.17	$ 83.14
Stock unit grant during period	301,321	204,599	161,229
Management \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 50.69	$ 68.48
Stock unit grant during period	62,512	45,883
Management \| Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 62.05	$ 86.23	$ 105.74
Stock unit grant during period	51,063	36,646	60,187
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	4,173,554
Stock Options Issued In Fiscal 2010 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period (in years)	10 years

Share based compensation arrangement by share based payment award, award expiration period.

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Share based compensation arrangement by share based payment award options non vested stock outstanding weighted average remaining contractual term

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

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award 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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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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