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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,477,358	$ 1,455,355
Other comprehensive income (loss) before reclassifications	5,379	(12,467)
Amounts reclassified from accumulated other comprehensive income (loss)	0	(454)
Total other comprehensive income (loss)	5,379	(12,921)
Ending Balance	1,534,509	1,298,108
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(16,950)	(28,328)
Other comprehensive income (loss) before reclassifications	5,422	(12,617)
Total other comprehensive income (loss)	5,422	(12,617)
Ending Balance	(11,528)	(40,945)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(170)	324
Other comprehensive income (loss) before reclassifications	(43)	150
Amounts reclassified from accumulated other comprehensive income (loss)	0	(454)
Total other comprehensive income (loss)	(43)	(304)
Ending Balance	(213)	20
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(17,120)	(28,004)
Ending Balance	$ (11,741)	$ (40,925)

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