Condensed Consolidated Statement of Changes In Shareholders' Equity (Unaudited) - 9 months ended Jun. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Sep. 30, 2015		64,654
Beginning Balance at Sep. 30, 2015	$ 2,947,170	$ 64,654	$ 213,096	$ 2,670,148	$ (728)
Increase (Decrease) in Stockholders' Equity
Net income	261,023			261,023
Other comprehensive income	(2,182)				(2,182)
Dividends	(5,582)			(5,582)
Vesting of restricted stock and performance unit awards (in shares)		144
Vesting of restricted stock and performance unit awards	(930)	$ 144	(1,074)
Stock compensation expense	8,224		8,224
Stock compensation windfall tax benefits	14,797		14,797
Ending Balance (in shares) at Jun. 30, 2016		64,798
Ending Balance at Jun. 30, 2016	$ 3,222,520	$ 64,798	$ 235,043	$ 2,925,589	$ (2,910)