Acquisitions 2 (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Jun. 30, 2016 USD ($) $ / shares
Unaudited pro forma combined financial information for the Company, Automic and Veracode as though combined as of beginning of fiscal year 2017
Total revenue | $	$ 1,048
Net income | $	$ 162
Basic income per common share (in dollars per share) | $ / shares	$ 0.39
Diluted income per common share (in dollars per share) | $ / shares	$ 0.39