Stock-Based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	$ 22,701	$ 14,477	$ 14,774
Income tax benefit	(5,441)	(3,308)	(3,546)
Total stock-based compensation expense, net of tax	17,260	11,169	11,228
Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	7,820	6,509	6,588
Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	1,900	2,851	2,373
LTIP PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	11,555	2,203	885
LTIP NQSOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	0	1,641	3,516
Grants to Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	1,195	1,045	1,223
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense, pre-tax	$ 231	$ 228	$ 189
Number of shares authorized (in shares)	1,000,000
Award purchase period	6 months
Discount from market price	15.00%

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

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