SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
SEC Schedule, 12-09, Allowance, Credit Loss
Segment Reporting Information [Line Items]
Balance at Beginning of Year	$ 7,881	$ 6,408	$ 5,966
Recorded to Cost and Expense	14,394	6,254	4,048
Accounts Written Off, net	(4,516)	(4,799)	(4,749)
Other	(1)	18	1,143
Balance at End of Year	17,758	7,881	6,408
Inventory valuation
Segment Reporting Information [Line Items]
Balance at Beginning of Year	26,169	26,065	16,419
Recorded to Cost and Expense	10,542	2,774	1,924
Accounts Written Off, net	(3,412)	(2,614)	(306)
Other	325	(56)	8,028
Balance at End of Year	33,624	26,169	26,065
Deferred tax valuation allowance
Segment Reporting Information [Line Items]
Balance at Beginning of Year	10,823	8,520	17,466
Recorded to Cost and Expense	(999)	2,303	(8,946)
Accounts Written Off, net	0	0	0
Other	0	0	0
Balance at End of Year	9,824	10,823	8,520
Bad debts | SEC Schedule, 12-09, Allowance, Credit Loss
Segment Reporting Information [Line Items]
Balance at Beginning of Year	1,881	1,824	1,109
Recorded to Cost and Expense	2,231	464	(40)
Accounts Written Off, net	(255)	(425)	11
Other	(1)	18	744
Balance at End of Year	3,856	1,881	1,824
Sales returns and allowances | SEC Schedule, 12-09, Allowance, Credit Loss
Segment Reporting Information [Line Items]
Balance at Beginning of Year	6,000	4,584	4,857
Recorded to Cost and Expense	12,163	5,790	4,088
Accounts Written Off, net	(4,261)	(4,374)	(4,760)
Other	0	0	399
Balance at End of Year	$ 13,902	$ 6,000	$ 4,584