Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Finite-Lived Intangible Assets
Gross carrying amount	$ 536,540	$ 536,498
Accumulated amortization	405,864	377,112
Net book value	130,676	159,386
Capitalized software and development costs
Finite-Lived Intangible Assets
Gross carrying amount	320,113	308,926
Accumulated amortization	269,872	256,145
Net book value	50,241	52,781
Customer and Vendor Relationship
Finite-Lived Intangible Assets
Gross carrying amount	175,872	184,894
Accumulated amortization	107,267	95,865
Net book value	68,605	89,029
Other intangible assets
Finite-Lived Intangible Assets
Gross carrying amount	40,555	42,678
Accumulated amortization	28,725	25,102
Net book value	$ 11,830	$ 17,576