CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Treasury Stock	Total
Beginning Balance at Sep. 30, 2021	$ 878	$ 1,976,112	$ 19,351	$ (470,051)	$ (200,956)	$ 1,325,334
Beginning Balance (in shares) at Sep. 30, 2021	87,808,922
Increase (Decrease) in Stockholders' Equity
Shares issued/ retired under restricted stock and purchase plans, net	$ 6	(6)
Shares issued/ retired under restricted stock and purchase plans, net (in shares)	566,488
Stock-based compensation		1,465				1,465
Common stock dividends declared				(7,494)		(7,494)
Foreign currency translation adjustments			4,801			4,801
Actuarial loss, net of tax effects			(3)			(3)
Net income				43,320		43,320
Ending Balance at Dec. 31, 2021	$ 884	1,977,571	24,149	(434,225)	(200,956)	1,367,423
Ending Balance (in shares) at Dec. 31, 2021	88,375,410
Beginning Balance at Sep. 30, 2022	$ 885	1,992,017	(83,916)	1,655,356	(200,956)	$ 3,363,386
Beginning Balance (in shares) at Sep. 30, 2022	88,482,125					75,020,256
Increase (Decrease) in Stockholders' Equity
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes					(4,629)	$ (4,629)
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes (in shares)	123,926
Accelerated share repurchase					(500,000)	(500,000)
Accelerated share repurchase (in shares)	(6,090,134)
Retirement of treasury shares	$ (61)	(504,568)			504,629
Stock-based compensation		2,105				2,105
Net investment hedge currency translation adjustment			(57,127)			(57,127)
Foreign currency translation adjustments			77,414			77,414
Changes in unrealized gains (losses) on marketable securities, net of tax			1,555			1,555
Net income				(11,235)		(11,235)
Other				(81)		(81)
Ending Balance at Dec. 31, 2022	$ 824	$ 1,489,554	$ (62,074)	$ 1,644,041	$ (200,956)	$ 2,871,389
Ending Balance (in shares) at Dec. 31, 2022	82,515,917					69,054,048