Leases - Schedule of Financing Lease (Details) - USD ($)	Nov. 30, 2020	May 31, 2020
Leases [Abstract]
Non-cancellable financing leases	$ 4,500,077	$ 5,455,656
Less: Current portion	(1,920,854)	(1,838,251)
Non-cancellable financing leases, net of current portion	$ 2,579,223	$ 3,617,405