DEBT - Credit Facility (Details) - Credit Facility $ in Millions	3 Months Ended
	Dec. 31, 2020 USD ($)
Revolving credit facility
Revolving credit limit	$ 110.0
Increase in borrowing capacity available under loan accordion	25.0
Additional credit advances for certain inventory purchases	$ 10.0
Automatic renewal period of agreement unless terminated	1 year
Unused commitment fee (as a percent)	0.25%
Period considered for computing fixed charge coverage ratio	12 months
Threshold of excess availability of credit as a percentage of maximum loan limit, required for financial covenant compliance	10.00%
Restricted amount of dividends on common stock	$ 3.5
Current credit limit of the Facility	87.7
Outstanding borrowings under the Facility	33.1
Credit available under the Facility	$ 54.6
Average interest rate	2.13%
Peak borrowings under the Facility	$ 71.7
Average borrowings under the Facility	49.5
Average availability under the Facility	$ 43.1
LIBOR
Revolving credit facility
Variable rate basis	LIBOR
Minimum basis points added to reference rate (as a percent)	0.50%
Prime rate
Revolving credit facility
Variable rate basis	prime rate
Minimum
Revolving credit facility
Notice period prior to the end of any original or renewal term of the agreement required for terminating the agreement either by the borrower or lender	90 days
Fixed charge coverage ratio	1.0
Minimum | LIBOR
Revolving credit facility
Basis points added to reference rate (as a percent)	1.25%
Maximum | LIBOR
Revolving credit facility
Basis points added to reference rate (as a percent)	1.50%