Stockholders' Equity (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jan. 03, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2016	Aug. 14, 2014	Aug. 04, 2014
Class of Stock [Line Items]
Preferred stock, shares authorized			5,000,000		5,000,000.0
Common stock, shares authorized			500,000,000		500,000,000
Stock authorized to repurchase		$ 100,000,000		$ 100,000,000			$ 600,000,000
Repurchases of common stock, shares			2,700,000	5,100,000
Repurchases of common stock, value			$ (64,940,000)	$ (187,415,000)
Stock repurchased in the period , including holdback				224,900,000
Common stock repurchase holdback				37,500,000
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized					500,000
Accelerated Share Repurchase Agreement [Member]
Class of Stock [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt						$ 125,000,000
Repurchases of common stock, shares	1,100,000	2,300,000
Common stock repurchase holdback				$ 37,500,000