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Income Taxes - Reconciliation of Income Taxes at Statutory Rate (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
United States statutory income tax expense		$ 35,729	$ 30,857	$ 38,264
Impact of Tax Act	$ 21,000	0	0	(13,483)
State income taxes, net of federal effect		4,000	2,764	3,285
Nondeductible expenses and other		5,273	5,953	4,378
Legal proceedings charge - European Competition Investigations		0	0	2,405
Net effect of GILTI, FDII, BEAT		1,985	3,025	2,320
Goodwill impairment - See Note 7		0	10,714	0
Effect of foreign operations		(20,035)	(17,605)	(16,763)
Valuation allowance		5,533	4,349	2,879
Switzerland Tax Reform		(1,883)	(26,846)	0
Research and Development Credit		(3,841)	(3,390)	(1,701)
Total income tax expense		$ 26,761	$ 9,821	$ 21,584

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