Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 410,042	$ 375,868
Accumulated amortization	264,197	237,889
Net book value	145,845	137,979
Capitalized Software And Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	302,326	280,751
Accumulated amortization	223,148	208,799
Net book value	79,178	71,952
Customer And Vendor Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	98,080	85,076
Accumulated amortization	36,544	26,059
Net book value	61,536	59,017
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,636	10,041
Accumulated amortization	4,505	3,031
Net book value	$ 5,131	$ 7,010