v3.7.0.1

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	823,554
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	242,068	127,966	76,512
Stock-based compensation expense	$ 1,705	$ 477	$ 1,470
Stock-based compensation expense, net of tax	457	1,419	502
Unrecognized compensation expense associated with non-vested incentive awards outstanding	$ 30,113
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Stock Outstanding Weighted Average Remaining Contractual Term	19 months
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 56.40
Stock unit grant during period	264,305
Restricted Shares Restricted Stock Units and Market Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 17,480	$ 18,184	$ 23,789
Stock unit grant during period	1,239	565	3,434
Equity-based compensation expense, tax benefit	$ 4,210	$ 4,446	$ 4,790
Non Employee Directors | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted	25,708	28,970	14,781
Market price per unit of stock award	$ 69.97	$ 55.32	$ 61.16
Management | Nonqualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	242,068
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	$ 57.60	$ 68.40	$ 69.83
Stock unit grant during period	237,358	120,287	118,312
Management | Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award	$ 70.79	$ 59.94	$ 70.42
Stock unit grant during period	83,720	212,635	152,300
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,177,477
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

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

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