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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,313,084
Other comprehensive income (loss) before reclassifications	1,786	$ 9,573
Amounts reclassified from accumulated other comprehensive income (loss)	14	13
Net current-period other comprehensive income (loss)	1,800	9,586
Ending Balance	1,332,690	1,174,053
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(34,012)	(23,479)
Other comprehensive income (loss) before reclassifications	1,788	9,590
Net current-period other comprehensive income (loss)	1,788	9,590
Ending Balance	(32,224)	(13,889)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(57)	28
Other comprehensive income (loss) before reclassifications	(2)	(17)
Amounts reclassified from accumulated other comprehensive income (loss)	14	13
Net current-period other comprehensive income (loss)	12	(4)
Ending Balance	(45)	24
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(34,069)	(23,451)
Ending Balance	$ (32,269)	$ (13,865)

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

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