Restricted Stock Units, Conversion Ratio For Securities Into Which Each RSU May Be Converted

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Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisability Period, from Date of Grant

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Share-based Compensation Arrangement by Share-based Payment Award, Vested in Period, Total Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Extension of Expiration Period

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- Definition

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

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

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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 tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option 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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- Definition

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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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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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

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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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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- Definition

The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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

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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Jul. 30, 2019 shares	May 13, 2019 $ / shares shares	May 06, 2019 $ / shares shares	May 31, 2014 shares	Jun. 30, 2014 shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 USD ($) shares	Mar. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase to plan term					10 years
Stock-based compensation costs \| $						$ 7,644	$ 7,438	$ 8,909
Tax benefit recognized from share-based compensation expense \| $						1,200	1,400	1,800
Share-based compensation expense, not yet recognized \| $						$ 6,000
Share-based compensation expense, not yet recognized, period for recognition						1 year
Total fair value of shares vested \| $						$ 7,800	12,000	6,800
Proceeds from exercise of stock options \| $						1,324	2,931	1,620
Income tax benefit realized from exercise of stock awards \| $						$ 700	$ 1,300	$ 1,100
Number of shares available for issuance under plan (in shares)						1,500,000
Options granted (in shares)						302,700	294,500	182,800
Options exercised, intrinsic value \| $						$ 400	$ 800	$ 1,200
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock units granted in period (in shares)			98,644
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock units granted in period (in shares)	4,183	7,287	89,286			220,300	226,400	105,800
Restricted Stock Units (RSUs) \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, conversion ratio for securities into which each RSU may be converted						1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		21,194	281,487
Award grant exercise price (in dollars per share) \| $ / shares		$ 30.19	$ 30.56
Award exercisability period, from date of grant (not greater than)						10 years
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						5 years
2005 Long-term Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)						5,000,000.0
Number of additional shares authorized under plan (in shares)					1,800,000
Maximum number of shares awarded, per employee, annual (in shares)				1,000,000.0	2,500,000