Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Total non cancellable purchase commitments	$ 100.2
Total non-cancellable purchase commitments, term	for periods through fiscal 2020
Royalty expense recorded under cost of license and other revenue	$ 17.4	$ 17.9	$ 18.0