SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Segment Reporting Information [Line Items]
Balance at Beginning of Year	$ 6,408	$ 5,966	$ 4,692
Recorded to Cost and Expense	(1,867)	(5,920)	1,680
Accounts Written Off, net	3,323	5,219	(406)
Other	18	1,143	0
Balance at End of Year	7,881	6,408	5,966
Inventory valuation [Member]
Segment Reporting Information [Line Items]
Balance at Beginning of Year	26,065	16,419	15,338
Recorded to Cost and Expense	2,774	1,924	851
Accounts Written Off, net	(2,614)	(306)	203
Other	(56)	8,028	27
Balance at End of Year	26,169	26,065	16,419
Deferred tax valuation allowance [Member]
Segment Reporting Information [Line Items]
Balance at Beginning of Year	8,520	17,466	12,832
Recorded to Cost and Expense	2,302	(8,946)	4,634
Accounts Written Off, net	0	0	0
Other	0	0	0
Balance at End of Year	10,823	8,520	17,466
Bad debts [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Segment Reporting Information [Line Items]
Balance at Beginning of Year	1,824	1,109	1,217
Recorded to Cost and Expense	464	(40)	279
Accounts Written Off, net	(425)	11	(387)
Other	18	744	0
Balance at End of Year	1,881	1,824	1,109
Sales returns and allowances [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Segment Reporting Information [Line Items]
Balance at Beginning of Year	4,584	4,857	3,475
Recorded to Cost and Expense	(2,331)	(5,880)	1,401
Accounts Written Off, net	3,748	5,208	(19)
Other	0	399	0
Balance at End of Year	$ 6,000	$ 4,584	$ 4,857