Consolidated Statement Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 39,328	$ 14,695	$ 52,795	$ 32,455
Other comprehensive income [Abstract]
Foreign currency translation adjustment	(47,796)	(1,956)	(935)	(49,565)
Total comprehensive (loss) income	$ (8,468)	$ 12,739	$ 51,860	$ (17,110)