Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jan. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency exchange contracts	$ 356	$ 882
Contingent consideration	(6,150)	(6,120)
Total	(5,794)	(5,238)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency exchange contracts	356	882
Contingent consideration	0	0
Total	356	882
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency exchange contracts	0	0
Contingent consideration	(6,150)	(6,120)
Total	$ (6,150)	$ (6,120)