Leases - Schedule of Financing Lease (Details) - USD ($)	May 31, 2020	May 31, 2019
Leases [Abstract]
Non-cancelable financing leases	$ 5,455,656	$ 6,754,819
Less: Current portion of financing leases	(1,838,251)	(1,516,629)
Non-cancelable financing leases, net of current portion	$ 3,617,405	$ 5,238,190