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Change in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance $ (12,320) $ 1,720 $ (15,427) $ (968)
Other comprehensive income (loss) before reclassifications 2,289 565 5,393 3,183
Amounts reclassified from accumulated other comprehensive income (loss) 39 101 42 171
Net current-period other comprehensive income (loss) 2,328 666 5,435 3,354
Ending Balance (9,992) 2,386 (9,992) 2,386
Foreign Currency Translation        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance (12,371) 1,480 (15,516) (1,388)
Other comprehensive income (loss) before reclassifications 2,353 828 5,498 3,696
Net current-period other comprehensive income (loss) 2,353 828 5,498 3,696
Ending Balance (10,018) 2,308 (10,018) 2,308
Unrealized Gains and (Losses) on available- for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance 51 240 89 420
Other comprehensive income (loss) before reclassifications (64) (263) (105) (513)
Amounts reclassified from accumulated other comprehensive income (loss) 39 101 42 171
Net current-period other comprehensive income (loss) (25) (162) (63) (342)
Ending Balance $ 26 $ 78 $ 26 $ 78