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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,745,740	$ 1,477,358	$ 1,455,355
Net current-period total other comprehensive income (loss)	(23,805)	(7,710)	10,884
Ending Balance	1,792,683	1,745,740	1,477,358
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	(20,620)	(5,254)
Net current-period total other comprehensive income (loss)	(20,620)	(5,254)
Ending Balance	(42,824)	(22,204)	(16,950)
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	(1,720)	(2,467)
Amounts reclassified from accumulated other comprehensive income (loss)	(1,465)	11
Net current-period total other comprehensive income (loss)	(3,185)	(2,456)
Ending Balance	(5,811)	(2,626)	(170)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(24,830)	(17,120)	(28,004)
Other comprehensive income (loss) before reclassifications	(22,340)	(7,721)
Amounts reclassified from accumulated other comprehensive income (loss)	(1,465)	11
Net current-period total other comprehensive income (loss)	(23,805)	(7,710)
Ending Balance	$ (48,635)	$ (24,830)	$ (17,120)

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