Earnings (Loss) Per Share - Summary of Dilutive or Potentially Dilutive Instruments Outstanding (Details) - shares	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Total potential incremental shares	124,759,322	214,175,813
Stock Warrants [Member]
Total potential incremental shares	31,899,133	7,243,333
Stock Options [Member]
Total potential incremental shares		3,000,000
Convertible Notes [Member]
Total potential incremental shares	60,231,439	98,287,940
Convertible Preferred Stock [Member]
Total potential incremental shares	32,628,750	105,644,540