Income Taxes - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Contingency [Line Items]
Income taxes paid				$ 48,653,000	$ 53,866,000	$ 28,044,000
Blended rate			21.00%	21.00%	31.55%
Provisional Transition Tax liability	$ 97,500,000
Income tax expense (benefit)			$ 13,483,000
Net operating loss carryforwards carried forward indefinitely			112,405,000
Net operating loss carryforwards subject to expiration			(45,847,000)
Valuation allowance			20,951,000	$ 17,519,000
Income tax expense		$ 21,000	9,821,000	$ 21,584,000	$ 118,493,000
Effective income tax rates				6.70%	11.90%	49.70%
Deferred tax asset			22,500,000
Foreign pre-tax income			$ 110,744,000	$ 128,872,000	$ 163,886,000
Foreign pre-tax income, percent			(7.40%)	12.30%	5.20%
Tax rate of Swiss subsidiary			3.00%	4.00%	8.00%
Undistributed earnings of foreign subsidiaries				$ 1,376,000,000	$ 1,167,000,000
Unrecognized tax benefits			$ 7,795,000	20,165,000	$ 1,568,000	$ 1,450,000
Estimated change in unrecognized tax benefit in fiscal 2015			1,250,000
Tax related interest and penalties			285,000	75,000
Foreign
Income Tax Contingency [Line Items]
United States federal net operating loss carryforwards			158,252,000
Valuation allowance			20,055,000	15,594,000
Increase (decrease) in deferred tax asset			4,461,000
Income tax expense			4,351,000
Federal
Income Tax Contingency [Line Items]
United States federal net operating loss carryforwards			1,258,000
Valuation allowance			0	1,027,000
State
Income Tax Contingency [Line Items]
United States federal net operating loss carryforwards			34,473,000
Valuation allowance			896,000	$ 898,000
Foreign Currency Translation Adjustment And Offset Adjustment To Net Operating Losses | Foreign
Income Tax Contingency [Line Items]
Increase (decrease) in deferred tax asset			110,000
Alpha
Income Tax Contingency [Line Items]
Unrecognized tax benefits			769,000
Indemnification asset			769,000
Alpha | Federal
Income Tax Contingency [Line Items]
Increase (decrease) in deferred tax asset			$ (1,027,000)