Domestic and Foreign Pre-tax Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]
Domestic	$ (62,943)	$ (56,810)	$ (75,899)
Foreign	145,267	88,822	56,258
Total pre-tax income (loss)	$ 82,324	$ 32,012	$ (19,641)