CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Balance at beginning of period at Sep. 30, 2017	$ 11,196	$ 487,248	$ 3,855,686	$ 2,300	$ (191,839)	$ 4,164,591
Balance (in shares) at Sep. 30, 2017	111,957,000					111,956,875
Balance (in shares) at Sep. 30, 2017					3,353,000
Increase (Decrease) in Shareholders' Equity
Net income (loss)			480,219			$ 480,219
Other comprehensive income (loss)				6,642		6,642
Dividends declared			(231,932)			(231,932)
Exercise of stock options, net of shares withheld for employee taxes		(5,147)			$ 8,503	3,356
Exercise of stock options, net of tax withholding (in shares)	1,000				(152,000)
Cumulative effect adjustment for adoption of Accounting Standards Update 2016-09 | ASU 2016-09		872	(555)			317
Stock issued for vested restricted stock, net of shares withheld for employee taxes	$ 5	(11,841)			$ 7,662	(4,174)
Stock issued for vested restricted stock, net of shares withheld for employee taxes (in shares)	51,000				(136,000)
Stock-based compensation		23,472				23,472
Balance at end of period at Jun. 30, 2018	$ 11,201	494,604	4,103,418	8,942	$ (175,674)	$ 4,442,491
Balance (in shares) at Jun. 30, 2018	112,009,000					112,008,961
Balance (in shares) at Jun. 30, 2018					3,065,000
Balance at beginning of period at Mar. 31, 2018				(5,221)
Increase (Decrease) in Shareholders' Equity
Net income (loss)						$ (8,008)
Other comprehensive income (loss)						14,163
Balance at end of period at Jun. 30, 2018	$ 11,201	$ 494,604	$ 4,103,418	$ 8,942	$ (175,674)	$ 4,442,491
Balance (in shares) at Jun. 30, 2018	112,009,000					112,008,961
Balance (in shares) at Jun. 30, 2018					3,065,000