Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Receivable allowances	$ 856	$ 1,018
Reserves and accruals	24,141	24,473
Inventory valuation and other assets	4,617	4,989
Investment in partnership	1,592	2,569
Unrealized foreign exchange gains (losses), including related hedges	5,332	6,730
Other deferred taxes	3,474	897
Deferred Tax Asset, Interest Carryforward	0	7,096
Net operating loss carryforwards	29,407	49,786
Gross deferred tax assets	69,419	97,558
Less: Valuation allowance	(23,298)	(41,084)
Deferred Tax Assets, Net of Valuation Allowance	46,121	56,474
Goodwill	(6,579)	(9,801)
Fixed assets	(32,136)	(38,293)
Intangibles	(15,509)	(15,720)
Other deferred tax liabilities	(1,427)	(3,418)
Gross deferred tax liabilities	(55,651)	(67,232)
Net deferred tax liabilities	$ (9,530)	$ (10,758)