Goodwill And Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 198,565,000	$ 230,472,000
Capitalized intangible assets	10,400,000	19,000,000	156,400,000
Interest costs capitalized	0	0	0
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Amortization expense	$ 49,500,000	$ 51,800,000	$ 37,800,000
Capitalized software and development costs
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years	6 years	8 years