Stock-Based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation, pre-tax	$ 26,897	$ 26,816	$ 22,701
Income tax benefit	(6,557)	(6,496)	(5,441)
Total stock-based compensation, net of tax	$ 20,340	20,320	17,260
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,000,000
Award purchase period (in months)	6 months
Discount from market price	15.00%
Total stock-based compensation, pre-tax	$ 510	351	231
RSUs, PSUs, LTIP PSUs And Grants To Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation, pre-tax	26,387	26,465	22,470
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation, pre-tax	13,249	12,093	7,820
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation, pre-tax	0	0	1,900
LTIP PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation, pre-tax	11,275	12,865	11,555
Grants to Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation, pre-tax	$ 1,863	$ 1,507	$ 1,195

Share-based Compensation Arrangement By Share-based Payment Award Award Purchase Period

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

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Discount rate from fair value on purchase date that participants pay for shares.

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

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