Summary Of Significant Accounting Policies (Earnings Per Share Basic And Diluted) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			2,300,000
Net income (loss)	$ 160,194	$ 143,769	$ (35,398)
Weighted average shares outstanding (in shares)	118,094,000	119,473,000	118,705,000
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)	1,890,000	1,767,000	0
Diluted weighted average shares outstanding (in shares)	119,984,000	121,240,000	118,705,000
Basic earnings (loss) per share (in USD per share)	$ 1.36	$ 1.20	$ (0.30)
Diluted earnings (loss) per share (in USD per share)	$ 1.34	$ 1.19	$ (0.30)