Components of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Year Balance	$ 31,693	$ 26,164	$ 11,234
Changes During Year	(3,013)	5,529	14,930
End of Year Balance	28,680	31,693	26,164
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Year Balance	31,222	29,627	18,938
Changes During Year	(3,022)	1,595	10,689
End of Year Balance	28,200	31,222	29,627
Unrealized loss on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Year Balance	(2)	(1,587)	(6,510)
Changes During Year	(203)	1,585	4,923
End of Year Balance	(205)	(2)	(1,587)
Pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Year Balance	473	(1,876)	(1,194)
Changes During Year	212	2,349	(682)
End of Year Balance	$ 685	$ 473	$ (1,876)