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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,300,903
Other comprehensive income (loss) before reclassifications	(8,049)	$ 1,786
Amounts reclassified from accumulated other comprehensive income (loss)	(13)	14
Total other comprehensive (loss) income	(8,062)	1,800
Ending Balance	1,346,415	1,332,690
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(10,340)	(34,012)
Other comprehensive income (loss) before reclassifications	(7,969)	1,788
Total other comprehensive (loss) income	(7,969)	1,788
Ending Balance	(18,309)	(32,224)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(311)	(57)
Other comprehensive income (loss) before reclassifications	(80)	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	(13)	14
Total other comprehensive (loss) income	(93)	12
Ending Balance	(404)	(45)
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(10,651)	(34,069)
Ending Balance	$ (18,713)	$ (32,269)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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