Summary Of Significant Accounting Policies (Earnings Per Share Basic And Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 02, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,700
Net income		$ (54,465)	$ 47,557	$ 160,194
Weighted average shares outstanding (in shares)		114,612	114,775	118,094
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)		0	1,237	1,890
Diluted weighted average shares outstanding (in shares)		114,612	116,012	119,984
Basic earnings (loss) per share (in USD per share)		$ (0.48)	$ 0.41	$ 1.36
Diluted earnings (loss) per share (in USD per share)		$ (0.48)	$ 0.41	$ 1.34