Goodwill and Intangible Assets (Details 1)	12 Months Ended
	Jan. 31, 2013
Summary of Weighted average estimated remaining useful life
Weighted Average Estimated Remaining Useful Life	3 years
Technology, licenses and patents [Member]
Summary of Weighted average estimated remaining useful life
Weighted Average Estimated Remaining Useful Life	2 years 8 months 12 days
Customer relationships [Member]
Summary of Weighted average estimated remaining useful life
Weighted Average Estimated Remaining Useful Life	1 year 3 months 18 days
Trademarks [Member]
Summary of Weighted average estimated remaining useful life
Weighted Average Estimated Remaining Useful Life	1 year 3 months 18 days
Internal-use software [Member]
Summary of Weighted average estimated remaining useful life
Weighted Average Estimated Remaining Useful Life	3 years