Leases - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019 showroom	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Finance lease liability		$ 0.0
Number of closed showrooms | showroom	4
Operating lease not yet commenced, right-of-use asset		0.8
Operating lease not yet commenced, liability		$ 0.8
Operating lease not yet commenced, term of contract (in years)		5 years 6 months
Leaseholds and Leasehold Improvements
Lessee, Lease, Description [Line Items]
Impairment loss		$ 0.8	$ 3.7