Sale and Leaseback of Real Estate - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 23, 2022	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Annual base rent	$ 1.5
Pretax gain on sale and lease back transaction		$ 12.5
Net cash inflow, after repayment of existing mortgage and settlement of related sale expenses		$ 14.9
Term of absolute triple net lease	The sale price was $20.6 million, of which $0.7 million was deducted at closing for commission and other closing expenses. Simultaneously with the closing, BTU entered into a two-year leaseback of the Property. The lease terms include annual base rent of $1.5 million in an absolute triple net lease.
Property
Lessee, Lease, Description [Line Items]
Sale of property	$ 20.6
Sale price deducted for sale leaseback transaction commission and other closing expenses	$ 0.7