Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from Contracts with Customers
Topic 606 revenue	$ 30,022,000	$ 30,964,000
Unearned rental revenue included in trade payables and accrued liabilities	27,115,000		$ 24,642,000
Unearned rental revenue recognized			12,145,000	$ 10,821,000
Warranty reserve included in trade payables and accrued liabilities	111,199		$ 136,394
Rental-related services
Revenue from Contracts with Customers
Topic 606 revenue	$ 10,922,000	$ 13,510,000