Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 536,498	$ 529,247
Accumulated amortization	377,112	352,493
Intangible Assets, Net (Excluding Goodwill)	159,386	176,754
Capitalized software and development costs
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	308,926	307,759
Accumulated amortization	256,145	250,987
Intangible Assets, Net (Excluding Goodwill)	52,781	56,772
Customer and Vendor Relationship
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	184,894	180,659
Accumulated amortization	95,865	82,512
Intangible Assets, Net (Excluding Goodwill)	89,029	98,147
Preferred Supplier Agreement
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,930	28,276
Accumulated amortization	14,613	11,032
Intangible Assets, Net (Excluding Goodwill)	12,317	17,244
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	15,748	12,553
Accumulated amortization	10,489	7,962
Intangible Assets, Net (Excluding Goodwill)	$ 5,259	$ 4,591