Summary Of Significant Accounting Policies (Earnings Per Share Basic And Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Accounting Policies [Abstract]
Net income	$ 47,557	$ 160,194	$ 143,769
Weighted average shares outstanding (in shares)	114,775	118,094	119,473
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)	1,237	1,890	1,767
Diluted weighted average shares outstanding (in shares)	116,012	119,984	121,240
Basic earnings (loss) per share (in USD per share)	$ 0.41	$ 1.36	$ 1.20
Diluted earnings (loss) per share (in USD per share)	$ 0.41	$ 1.34	$ 1.19