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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,745,740	$ 1,477,358
Other comprehensive income (loss) before reclassifications	(19,654)	5,379
Amounts reclassified from accumulated other comprehensive income (loss)	(112)
Total other comprehensive (loss) income	(19,766)	5,379
Ending Balance	1,695,921	1,534,509
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(22,204)	(16,950)
Other comprehensive income (loss) before reclassifications	(14,389)	5,422
Total other comprehensive (loss) income	(14,389)	5,422
Ending Balance	(36,593)	(11,528)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(2,626)	(170)
Other comprehensive income (loss) before reclassifications	(5,265)	(43)
Amounts reclassified from accumulated other comprehensive income (loss)	(112)
Total other comprehensive (loss) income	(5,377)	(43)
Ending Balance	(8,003)	(213)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(24,830)	(17,120)
Ending Balance	$ (44,596)	$ (11,741)

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