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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,695,921	$ 1,534,509	$ 1,745,740	$ 1,477,358
Other comprehensive income (loss) before reclassifications	(5,367)	(1,351)	(25,021)	4,028
Amounts reclassified from accumulated other comprehensive income (loss)	(222)	4	(334)	4
Total other comprehensive (loss) income	(5,589)	(1,347)	(25,355)	4,032
Ending Balance	1,707,192	1,669,420	1,707,192	1,669,420
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(36,593)	(11,528)	(22,204)	(16,950)
Other comprehensive income (loss) before reclassifications	(6,243)	(1,394)	(20,632)	4,028
Total other comprehensive (loss) income	(6,243)	(1,394)	(20,632)	4,028
Ending Balance	(42,836)	(12,922)	(42,836)	(12,922)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(8,003)	(213)	(2,626)	(170)
Other comprehensive income (loss) before reclassifications	876	43	(4,389)
Amounts reclassified from accumulated other comprehensive income (loss)	(222)	4	(334)	4
Total other comprehensive (loss) income	654	47	(4,723)	4
Ending Balance	(7,349)	(166)	(7,349)	(166)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(44,596)	(11,741)	(24,830)	(17,120)
Ending Balance	$ (50,185)	$ (13,088)	$ (50,185)	$ (13,088)

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