Fair Value Measurements of Financial Instruments - Summary of Financial Assets and Liabilities (Details) - USD ($)	Jul. 31, 2019	Apr. 30, 2019
Investments in unconsolidated entities	$ 207,500	$ 207,500
Total assets	207,500	207,500
Convertible notes payable	618,086	870,567
Notes payable	744,635	2,123,208
Total liabilities	1,362,721	2,993,775
Level 1 [Member]
Investments in unconsolidated entities
Total assets
Convertible notes payable
Notes payable
Total liabilities
Level 2 [Member]
Investments in unconsolidated entities
Total assets
Convertible notes payable
Notes payable
Total liabilities
Level 3 [Member]
Investments in unconsolidated entities	207,500	207,500
Total assets	207,500	207,500
Convertible notes payable	618,086	870,567
Notes payable	744,635	2,123,208
Total liabilities	$ 1,362,721	$ 2,993,775