Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,916,468
Stock options granted	169,703	242,068	127,966
Stock-based compensation expense	$ 2,741	$ 457	$ 1,419
Stock-based compensation expense, net of tax	$ 700	$ 1,705	$ 477
Market price per unit of stock award	$ 73.39	$ 65.88	$ 62.62
Unrecognized compensation expense associated with non-vested incentive awards outstanding	$ 35,772
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Stock Outstanding Weighted Average Remaining Contractual Term	22 months
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 74.78
Stock unit grant during period	195,982
Restricted Shares Restricted Stock Units and Market Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 16,712	$ 17,480	$ 18,184
Stock unit grant during period	1,345	1,239	565
Equity-based compensation expense, tax benefit	$ 3,325	$ 4,210	$ 4,446
Non Employee Directors \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted	33,408	25,708	28,970
Market price per unit of stock award	$ 46.24	$ 69.97	$ 55.32
Management \| Nonqualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	169,703
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	$ 83.14	$ 57.60	$ 68.40
Stock unit grant during period	161,229	237,358	120,287
Management \| Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 105.74	$ 70.79	$ 59.94
Stock unit grant during period	60,187	83,720	212,635
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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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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