Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Schedule Of Business Acquisitions Cost Of Acquired Entity [Line Items]
Total Consideration	$ 12,108	$ 26,881	$ 113,120
Net Tangible Assets	372	(601)	49,426
Amortizable Intangible Assets	3,420	13,110	24,900
Deferred Taxes Asset (Liability), Net, Noncurrent		(1,735)	(11,636)
Goodwill Amount	8,316	16,107	50,430
Valor [Member]
Schedule Of Business Acquisitions Cost Of Acquired Entity [Line Items]
Total Consideration			86,903
Net Tangible Assets			47,423
Amortizable Intangible Assets			18,600
Deferred Taxes Asset (Liability), Net, Noncurrent			(11,636)
Goodwill Amount			32,516
Other Acquired Entities [Member]
Schedule Of Business Acquisitions Cost Of Acquired Entity [Line Items]
Total Consideration			26,217
Net Tangible Assets			2,003
Amortizable Intangible Assets			6,300
Deferred Taxes Asset (Liability), Net, Noncurrent			0
Goodwill Amount			$ 17,914