Leases - Schedule of Financing Lease (Details) - USD ($)	Feb. 29, 2020	May 31, 2019
Leases [Abstract]
Present value of non-cancellable financing leases	$ 5,922,843	$ 6,754,819
Less: Current portion	(2,146,923)	(1,516,629)
Present value of non-cancellable financing leases, net of current portion	$ 3,775,920	$ 5,238,190