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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,489,098	$ 1,300,903
Other comprehensive income (loss) before reclassifications	(3,621)	(8,049)
Amounts reclassified from accumulated other comprehensive income (loss)	7	(13)
Total other comprehensive loss	(3,614)	(8,062)
Ending Balance	1,447,971	1,346,415
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(26,925)	(10,340)
Other comprehensive income (loss) before reclassifications	(3,800)	(7,969)
Total other comprehensive loss	(3,800)	(7,969)
Ending Balance	(30,725)	(18,309)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(178)	(311)
Other comprehensive income (loss) before reclassifications	179	(80)
Amounts reclassified from accumulated other comprehensive income (loss)	7	(13)
Total other comprehensive loss	186	(93)
Ending Balance	8	(404)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(27,103)	(10,651)
Ending Balance	$ (30,717)	$ (18,713)

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