Stock-Based Compensation - Summary of Changes in RSUs Outstanding (Details) - Restricted stock units - $ / shares shares in Millions			3 Months Ended
	Apr. 27, 2015	Jan. 01, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Number of RSUs:
Unvested units at beginning of period		5.0	6.4	4.3	5.0
Granted	0.2	0.3	0.1	2.4	0.3
Vested			(0.2)	(0.2)	(0.7)
Canceled			(0.3)	(0.1)	(0.3)
Unvested units at end of period			6.0	6.4	4.3
Weighted Average Grant Date Fair Value Per RSU (in dollars per share):
Unvested units at beginning of period		$ 13.12	$ 13.27	$ 13.39	$ 13.12
Granted	$ 12.83	$ 13.26	15.18	12.90	13.15
Vested			13.48	10.53	12.72
Canceled			13.82	14.32	15.08
Unvested units at end of period			$ 13.21	$ 13.27	$ 13.39