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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance $ 1,137,227 $ 1,327,969 $ 1,694,170
Other comprehensive income (loss) before reclassifications (10,535) (8,067)  
Amounts reclassified from accumulated other comprehensive income (loss) (83) 43  
Net current-period total other comprehensive income/(loss) (10,618) (8,024) (14,459)
Ending Balance 1,313,084 1,137,227 1,327,969
Foreign Currency Translation      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance (23,479) (15,516)  
Other comprehensive income (loss) before reclassifications (10,533) (7,963)  
Net current-period total other comprehensive income/(loss) (10,533) (7,963)  
Ending Balance (34,012) (23,479) (15,516)
Unrealized Gains and (Losses) on available- for-Sale Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance 28 89  
Other comprehensive income (loss) before reclassifications (2) (104)  
Amounts reclassified from accumulated other comprehensive income (loss) (83) 43  
Net current-period total other comprehensive income/(loss) (85) (61)  
Ending Balance (57) 28 89
Accumulated Other Comprehensive Income (Loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance (23,451) (15,427) (968)
Ending Balance $ (34,069) $ (23,451) $ (15,427)