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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance $ 1,313,084 $ 1,137,227 $ 1,327,969
Other comprehensive income (loss) before reclassifications 23,453 (10,535)  
Amounts reclassified from accumulated other comprehensive income (loss) (35) (83)  
Total other comprehensive income (loss) 23,418 (10,618) (8,024)
Ending Balance 1,300,903 1,313,084 1,137,227
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 23,672 (10,533)  
Total other comprehensive income (loss) 23,672 (10,533)  
Ending Balance (10,340) (34,012) (23,479)
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 (219) (2)  
Amounts reclassified from accumulated other comprehensive income (loss) (35) (83)  
Total other comprehensive income (loss) (254) (85)  
Ending Balance (311) (57) 28
Accumulated Other Comprehensive Loss      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance (34,069) (23,451) (15,427)
Ending Balance $ (10,651) $ (34,069) $ (23,451)