Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Income Statement [Abstract]
Total Income from Sales	$ 35,000		$ 75,000
Operating Expenses
Accounting and legal	30,831	52,195	76,785	128,975
General and administrative expenses	20,554	59,549	53,672	125,164
Research and development	124,301	204,413	365,709	603,191
Shareholder communication	13,124	40,536	50,467	89,604
Wages & Contractors	72,296	34,418	238,833	185,918
Operating Loss	(226,106)	(391,111)	(710,466)	(1,132,852)
Other Income (Expense)
Loss on debt settlement	(57,605)		(50,388)
Misc Revenue			15,000
Loss on issuance of note	(156,870)		(156,870)
Change in derivative liability	(311,071)		(311,071)
Interest expense	(237,081)	(281,137)	(552,258)	(478,417)
Total Other Income (Expense)	(762,627)	(281,137)	(1,055,587)	(478,417)
Net loss before noncontrolling interest	(988,733)	(672,248)	(1,766,053)	(1,611,269)
Net Loss Attributed to Noncontrolling Interest
Net Loss Attributed to the Company	$ (988,733)	$ (672,248)	$ (1,766,053)	$ (1,611,269)
Loss per share - basic and diluted	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.02)
Weighted average number of common shares outstanding - basic and diluted	103,289,817	91,538,504	101,865,541	86,696,000
Comprehensive loss:
Net Loss	$ (988,733)	$ (672,248)	$ (1,766,053)	$ (1,611,269)
Translation adjustments
Comprehensive loss	(988,733)	(672,248)	(1,766,053)	(1,611,269)
Comprehensive loss attributable Noncontrolling Interest
Comprehensive loss attributable to REGI U.S., Inc	$ (988,733)	$ (672,248)	$ (1,766,053)	$ (1,611,269)