Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cash Payments:
Interest	$ 42,343	$ 37,610	$ 28,191
Income Taxes	32,870	20,046	$ 39,974
Operating Cash Flows Used for Operating Leases	10,741	14,926
Non-Cash Financing Activities:
Right-of-use Assets Obtained for Capitalized Operating Lease Liabilities	$ 272	$ 621