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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ 1,313,084
Other comprehensive income (loss) before reclassifications	$ (1,399)	$ (10,624)	9,336	$ (14,122)
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(96)	(11)	(74)
Total other comprehensive (loss) income	(1,401)	(10,720)	9,325	(14,196)
Ending Balance	1,284,808	1,247,633	1,284,808	1,247,633
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(23,282)	(26,955)	(34,012)	(23,479)
Other comprehensive income (loss) before reclassifications	(1,388)	(10,665)	9,342	(14,141)
Total other comprehensive (loss) income	(1,388)	(10,665)	9,342	(14,141)
Ending Balance	(24,670)	(37,620)	(24,670)	(37,620)
Unrealized Gains and (Losses) on available- for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(61)	28	(57)	28
Other comprehensive income (loss) before reclassifications	(11)	41	(6)	19
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(96)	(11)	(74)
Total other comprehensive (loss) income	(13)	(55)	(17)	(55)
Ending Balance	(74)	(27)	(74)	(27)
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(23,343)	(26,927)	(34,069)	(23,451)
Ending Balance	$ (24,744)	$ (37,647)	$ (24,744)	$ (37,647)

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

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