CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 61,999	$ (118,278)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	65,464	64,180
Share-based compensation expense	10,897	11,170
Deferred income tax benefit	(9,546)	(32,771)
Impairment charges	9,435	215,568
Amortization of terminated interest rate swap contract	5,572	3,715
Amortization of debt issuance costs	1,699	1,549
Accretion on Asset Retirement Obligations	300	293
Non-cash foreign exchange loss (gain)	284	(1,392)
Loss on disposal of assets	21	560
Other	(608)	(1,933)
Changes in operating assets and liabilities:
Accounts receivable	(21,454)	(12,352)
Inventories	(12,752)	(1,423)
Prepaid expenses and other assets	(1,645)	(16,137)
Accounts payable	6,097	5,261
Accrued expenses and other liabilities	(5,556)	5,498
Net cash provided by operating activities	110,207	123,508
Cash flows from investing activities:
Additions to property, plant and equipment	(23,310)	(21,119)
Proceeds from the sale of assets	10	363
Net cash used in investing activities	(23,300)	(20,756)
Cash flows from financing activities:
Dividends paid	(26,524)	(26,115)
Proceeds from issuance of stock	16,834	10,279
Repurchases of common stock under Share Repurchase Program	(10,600)	(10,002)
Repayment of long-term debt	(7,987)	(5,325)
Repurchases of common stock withheld for taxes	(3,724)	(5,436)
Other financing activities	(264)	(72)
Net cash used in financing activities	(32,265)	(36,671)
Effect of exchange rate changes on cash	(2,936)	1,401
Increase in cash and cash equivalents	51,706	67,482
Cash and cash equivalents at beginning of period	185,979	257,354
Cash and cash equivalents at end of period	237,685	324,836
Supplemental Cash Flow Information:
Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of the period	2,177	4,180
Cash paid during the period for lease liabilities	3,730	4,079
Right of use asset obtained in exchange for lease liabilities	$ 294	$ 2,761