Condensed Consolidated Statement of Shareholders' Equity - 3 months ended Dec. 31, 2018 - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Total
Balance at beginning of period at Sep. 30, 2018	$ 11,201	$ 500,393	$ 4,027,779	$ 16,550	$ (173,188)	$ 4,382,735
Balance (in shares) at Sep. 30, 2018	112,009,000					112,008,961
Balance (in shares) at Sep. 30, 2018					3,015,000	3,015,243
Increase (Decrease) in Shareholders' Equity
Net income (loss)			18,959			$ 18,959
Other comprehensive income (loss)				225		225
Dividends declared			(78,488)			(78,488)
Exercise of employee stock options, net of shares withheld for employee taxes		(6,756)			$ 6,980	224
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)					(125,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes	$ 7	(16,673)			$ 12,129	(4,537)
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)	71,000				(215,000)
Stock-based compensation		7,158				7,158
Cumulate effect adjustment for adoption | ASU 2014-09			(38)			(38)
Cumulate effect adjustment for adoption | ASU 2016-01			29,071	(29,071)
Balance at end of period at Dec. 31, 2018	$ 11,208	$ 484,122	$ 3,997,283	$ (12,296)	$ (154,079)	$ 4,326,238
Balance (in shares) at Dec. 31, 2018	112,080,000					112,080,262
Balance (in shares) at Dec. 31, 2018					2,675,000	2,675,372