Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 583,746	$ 578,074
Accumulated amortization	345,843	308,516
Net book value	237,903	269,558
Capitalized software and development costs
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	328,456	330,116
Accumulated amortization	255,946	248,013
Net book value	72,510	82,103
Customer and Vendor Relationship
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	209,685	206,415
Accumulated amortization	74,461	52,608
Net book value	135,224	153,807
Preferred Supplier Agreement
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	32,120	31,536
Accumulated amortization	7,622	1,549
Net book value	24,498	29,987
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	13,485	10,007
Accumulated amortization	7,814	6,346
Net book value	$ 5,671	$ 3,661