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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,455,355	$ 1,489,098
Other comprehensive income (loss) before reclassifications	(12,467)	(3,621)
Amounts reclassified from accumulated other comprehensive income (loss)	(454)	7
Total other comprehensive (loss) income	(12,921)	(3,614)
Ending Balance	1,298,108	1,447,971
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(28,328)	(26,925)
Other comprehensive income (loss) before reclassifications	(12,617)	(3,800)
Total other comprehensive (loss) income	(12,617)	(3,800)
Ending Balance	(40,945)	(30,725)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	324	(178)
Other comprehensive income (loss) before reclassifications	150	179
Amounts reclassified from accumulated other comprehensive income (loss)	(454)	7
Total other comprehensive (loss) income	(304)	186
Ending Balance	20	8
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(28,004)	(27,103)
Ending Balance	$ (40,925)	$ (30,717)

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