Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (38,924)	$ (124,434)	$ (196,923)	$ (115,552)
Other comprehensive income (loss), before tax and net of reclassification adjustments:
Foreign currency translation and other gains (losses)	(13,692)	5,590	(15,876)	(1,601)
Unrealized gains (losses) on investments	1,278	(450)	(3,055)	1,388
Other comprehensive income (loss), before tax	(12,414)	5,140	(18,931)	(213)
Tax effect	0	427	0	(118)
Other comprehensive income (loss), net of tax	(12,414)	5,567	(18,931)	(331)
Comprehensive loss	$ (51,338)	$ (118,867)	$ (215,854)	$ (115,883)