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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,792,683	$ 1,745,740
Total other comprehensive (loss) income	5,297	(19,766)
Ending Balance	1,850,682	1,695,921
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(42,824)	(22,204)
Other comprehensive income (loss) before reclassifications	3,177	(14,389)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive (loss) income	3,177	(14,389)
Ending Balance	(39,647)	(36,593)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(5,811)	(2,626)
Other comprehensive income (loss) before reclassifications	2,119	(5,265)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)	112
Total other comprehensive (loss) income	2,120	(5,377)
Ending Balance	(3,691)	(8,003)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(48,635)	(24,830)
Other comprehensive income (loss) before reclassifications	5,296	(19,654)
Amounts reclassified from accumulated other comprehensive income (loss)	(1)	112
Total other comprehensive (loss) income	5,297	(19,766)
Ending Balance	$ (43,338)	$ (44,596)

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