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Schedule of Total Selling, General and Administrative Expenses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]      
Operating Units Selling, G&A $ 57,077 $ 53,787 $ 62,529
Corporate G&A 65,410 37,371 41,205
Total selling, general and administrative expenses $ 122,487 $ 91,158 $ 103,734