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Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2013
Oct. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance $ (13,017) $ (8,782) $ (6,856)
Other comprehensive income/(loss) before reclassifications 7,319 2,882  
Amounts reclassified from accumulated other comprehensive loss (37) 165  
Net current-period other comprehensive income/(loss) 7,282 3,047  
Ending Balance (5,735) (5,735) (6,856)
Accumulated Translation Adjustment
     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance (12,997) (8,582)  
Other comprehensive income/(loss) before reclassifications 6,961 2,546  
Net current-period other comprehensive income/(loss) 6,961 2,546  
Ending Balance (6,036) (6,036)  
Accumulated Net Unrealized Investment Gain (Loss)
     
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Beginning Balance (20) (200)  
Other comprehensive income/(loss) before reclassifications 358 336  
Amounts reclassified from accumulated other comprehensive loss (37) 165  
Net current-period other comprehensive income/(loss) 321 501  
Ending Balance $ 301 $ 301