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Supplemental Cash Flow Information - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]      
Cash paid during the year for interest $ 2,854 $ 2,966 $ 3,075
Cash paid during the year for income taxes 7,804 10,176 8,790
Cumulative-effect adjustment from adoption of accounting guidance 0 997 0
Shares issued for contingent compensation payment 425 425 0
Non-cash investing activities:      
Shares issued for acquisition of business 0 0 612
Conversion of note receivable 902 0 0
Contribution of investment for purchase of intangible assets 2,201 0 0
Non-cash financing activities:      
Establishment of net deferred tax assets related to tax receivable agreement 37,394 56,010 34,492
Dividends declared but not paid 8,027 5,673 3,893
Members’ distributions declared but not paid $ 5,829 $ 17,081 $ 11,837