Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Cash Payments:
Interest	$ 42,368	$ 43,663	$ 31,596
Income Taxes	140,786	124,482	131,512
Operating Cash Flows Used for Operating Leases	8,708	9,286	8,314
Noncash Financing Activities:
Right-of-use Assets Obtained for Capitalized Operating Lease	18,373	6,465	1,711
Excise Tax on Share Repurchases	$ 2,982	$ 3,432	$ 738