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Change in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance $ (15,427) $ (968)  
Other comprehensive income (loss) before reclassifications (8,067) (14,696)  
Amounts reclassified from accumulated other comprehensive income (loss) 43 237  
Net current-period total other comprehensive income/(loss) (8,024) (14,459) $ 7,814
Ending Balance (23,451) (15,427) (968)
Foreign Currency Translation      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance (15,516) (1,388)  
Other comprehensive income (loss) before reclassifications (7,963) (14,128)  
Net current-period total other comprehensive income/(loss) (7,963) (14,128)  
Ending Balance (23,479) (15,516) (1,388)
Unrealized Gains and (Losses) on available- for-Sale Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance 89 420  
Other comprehensive income (loss) before reclassifications (104) (568)  
Amounts reclassified from accumulated other comprehensive income (loss) 43 237  
Net current-period total other comprehensive income/(loss) (61) (331)  
Ending Balance $ 28 $ 89 $ 420