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Stock Plans - Summary of Treasury Share Transactions Under the Company's Stock Repurchase Program (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity [Abstract]    
Treasury shares at the beginning of period, Number of Shares 4,714 4,714
Treasury shares purchased, Number of Shares 119 0
Treasury shares at the end of period, Number of Shares 4,833 4,714
Treasury shares at the beginning of period, Amount $ (70,459) $ (70,459)
Treasury shares purchased, Amount (979) 0
Treasury shares at the end of period, Amount $ (71,438) $ (70,459)