Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Schedule of Business Acquisitions, Cost of Acquired Entity [Line Items]
Total Consideration	$ 26,881	$ 113,120	$ 24,662
Net Tangible Assets Acquired		49,426	1,341
Net Liabilities Assumed	(601)
Identifiable Intangible Assets Acquired	13,110	24,900	9,960
Deferred Tax Liability	(1,735)	(11,636)	(222)
Goodwill	16,107	50,430	13,583
Valor
Schedule of Business Acquisitions, Cost of Acquired Entity [Line Items]
Total Consideration		86,903
Net Tangible Assets Acquired		47,423
Identifiable Intangible Assets Acquired		18,600
Deferred Tax Liability		(11,636)
Goodwill		32,516
Other
Schedule of Business Acquisitions, Cost of Acquired Entity [Line Items]
Total Consideration		26,217
Net Tangible Assets Acquired		2,003
Identifiable Intangible Assets Acquired		6,300
Goodwill		$ 17,914