Condensed Consolidated Statement of Changes In Shareholders' Equity (Unaudited) - 3 months ended Dec. 31, 2015 - 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	39,081			39,081
Other comprehensive income	526				526
Dividends	(5,010)			(5,010)
Vesting of restricted stock and performance unit awards (in shares)		114
Vesting of restricted stock and performance unit awards	(599)	$ 114	(713)
Stock compensation expense	2,371		2,371
Ending Balance (in shares) at Dec. 31, 2015		64,768
Ending Balance at Dec. 31, 2015	$ 2,983,539	$ 64,768	$ 214,754	$ 2,704,219	$ (202)