Stock-Based Compensation - Schedule of Stock Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 14,477	$ 14,774	$ 14,306
Total stock-based compensation expense, pre-tax	14,477	14,774	14,306
Income tax benefit recognized	(3,308)	(3,546)	(4,906)
Net stock compensation expense	11,169	11,228	9,400
Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	6,509	6,588	7,761
Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2,851	2,373	1,829
LTIP PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2,203	885	0
LTIP NQSOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	1,641	3,516	3,432
Grants to Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	1,045	1,223	1,135
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan	$ 228	$ 189	$ 149
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	6 months
Discount from market price	15.00%

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Total Stock Compensation Expense, Pretax

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