Finance and Operating Leases (Details) - USD ($)	Dec. 31, 2021	Jun. 30, 2021	Jul. 31, 2020	Apr. 30, 2020
Finance and Operating Leases
Finance lease liability	$ 80,692,000	$ 68,904,000
Purchase option	$ 1
Minimum
Finance and Operating Leases
Finance lease term	1 year
Maximum
Finance and Operating Leases
Finance lease term	3 years
BALC
Finance and Operating Leases
Finance lease liability	$ 80,700,000	68,900,000
Available line of credit			$ 41,000,000.0	$ 25,000,000.0
Finance lease right-of-use assets	$ 56,900,000	49,000,000.0
Finance lease term	36 months
Purchase option	$ 1
Additional amount of borrowings as at the and of the reporting period		$ 54,000,000.0
BALC | Minimum
Finance and Operating Leases
Interest rate on finance lease (as a percent)	1.52%
Fixed interest rate (as a percent)	1.52%
BALC | Maximum
Finance and Operating Leases
Interest rate on finance lease (as a percent)	2.58%
Fixed interest rate (as a percent)	2.58%