Significant Components Of Deferred Income Tax Provision (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Schedule of Components of Deferred Tax Provision [Line Items]
Net changes in gross deferred tax assets and liabilities	$ (10,491)	$ (20,381)	$ (19,765)
Deferred tax assets increasing goodwill	(1,747)	(5,618)	(567)
Deferred tax assets reducing/(increasing) equity	36	(1,178)	506
Deferred tax assets increasing deferred charge and other liabilities	(1,690)	(305)	(13,823)
Increase in beginning-of-year balance of the valuation allowance for deferred tax assets	14,948	22,458	33,835
Total deferred	$ 1,056	$ (5,024)	$ 186