Condensed Consolidated Statement of Changes In Shareholders' Equity (Unaudited) - 6 months ended Mar. 31, 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	161,518			161,518
Other comprehensive income	(2,080)				(2,080)
Dividends	(5,582)			(5,582)
Vesting of restricted stock and performance unit awards (in shares)		140
Vesting of restricted stock and performance unit awards	(928)	$ 140	(1,068)
Stock compensation expense	5,009		5,009
Ending Balance (in shares) at Mar. 31, 2016		64,794
Ending Balance at Mar. 31, 2016	$ 3,105,107	$ 64,794	$ 217,037	$ 2,826,084	$ (2,808)