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Change in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance $ (9,992) $ 2,386 $ (15,427) $ (968)
Other comprehensive (loss) income before reclassifications (2,670) (9,117) 2,723 (5,935)
Amounts reclassified from accumulated other comprehensive income (loss) 11 30 53 202
Net current-period other comprehensive (loss) income (2,659) (9,087) 2,776 (5,733)
Ending Balance (12,651) (6,701) (12,651) (6,701)
Foreign Currency Translation        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance (10,018) 2,308 (15,516) (1,388)
Other comprehensive (loss) income before reclassifications (2,688) (9,089) 2,810 (5,393)
Net current-period other comprehensive (loss) income (2,688) (9,089) 2,810 (5,393)
Ending Balance (12,706) (6,781) (12,706) (6,781)
Unrealized Gains and (Losses) on available- for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance 26 78 89 420
Other comprehensive (loss) income before reclassifications 18 (28) (87) (542)
Amounts reclassified from accumulated other comprehensive income (loss) 11 30 53 202
Net current-period other comprehensive (loss) income 29 2 (34) (340)
Ending Balance $ 55 $ 80 $ 55 $ 80