Unaudited Condensed Consolidated Statement Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2013	$ 2,207,371	$ 64,057	$ 183,390	$ 1,961,405	$ (1,481)
Beginning Balance (in shares) at Sep. 30, 2013		64,057
Increase (Decrease) in Stockholders' Equity
Net income	228,622			228,622
Other comprehensive loss	56				56
Restricted stock awards (in shares)		161
Restricted stock awards	0	161	(161)
Exercise of employee stock options (in shares)		120
Exercise of employee stock options	3,468	120	3,348
Stock option and restricted stock award compensation expense	10,924		10,924
Ending Balance at Jun. 30, 2014	$ 2,450,441	$ 64,338	$ 197,501	$ 2,190,027	$ (1,425)
Ending Balance (in shares) at Jun. 30, 2014		64,338