Consolidated Statements of Stockholders' Equity - USD ($)	Reno Creek Project [Member] Common Stock [Member]	Reno Creek Project [Member] Additional Paid-in Capital [Member]	Reno Creek Project [Member] Share Issuance Obligation [Member]	Reno Creek Project [Member] Retained Earnings [Member]	Reno Creek Project [Member] AOCI Attributable to Parent [Member]	Reno Creek Project [Member]	North Reno Creek Project [Member] Common Stock [Member]	North Reno Creek Project [Member] Additional Paid-in Capital [Member]	North Reno Creek Project [Member] Share Issuance Obligation [Member]	North Reno Creek Project [Member] Retained Earnings [Member]	North Reno Creek Project [Member] AOCI Attributable to Parent [Member]	North Reno Creek Project [Member]	Diabase Project [Member] Common Stock [Member]	Diabase Project [Member] Additional Paid-in Capital [Member]	Diabase Project [Member] Share Issuance Obligation [Member]	Diabase Project [Member] Retained Earnings [Member]	Diabase Project [Member] AOCI Attributable to Parent [Member]	Diabase Project [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Share Issuance Obligation [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Jul. 31, 2016																			116,670,457
Balance at Jul. 31, 2016																			$ 116,670	$ 239,701,884		$ (209,353,946)	$ (14,730)	$ 30,449,878
Issued for equity financing, net of issuance costs (in shares)																			17,330,836
Issued for equity financing, net of issuance costs																			$ 17,331	19,404,020				$ 19,421,351
Issued upon exercise of stock options (in shares)																			264,727					412,134
Issued upon exercise of stock options																			$ 266	56,659				$ 56,925
Issued upon exercise of warrants (in shares)																			1,989,717
Issued upon exercise of warrants																			$ 1,989	2,385,671				$ 2,387,660
Issued for credit facility (in shares)																			738,503					738,503
Issued for credit facility																			$ 739	1,099,261				$ 1,100,000
USE Common shares (in shares)																			61,939
14,634,748 UEC common shares at $1.37 per share																			$ 62	87,555				87,617
Issued for advance royalty payment (in shares)																			46,800
Issued for advance royalty payment																			$ 46	48,626				48,672
Issued for settlement of liabilities (in shares)																			1,015,940
Issued for settlement of liabilities																			$ 1,016	1,523,634				1,524,650
Common stock issued for consulting services (in shares)																			865,386
Common stock issued for consulting services																			$ 862	1,107,075				1,107,937
Common stock issued under Stock Incentive Plan (in shares)																			830,819
Common stock issued under Stock Incentive Plan																			$ 834	945,418	638,142			1,584,394
Amortization of stock option expenses																				1,313,289				1,313,289
Issued for equity financing																				4,409,570				4,409,570
Issued for equity financing as issuance costs																				614,490				614,490
Net loss for the year																						(17,971,056)		(17,971,056)
Other comprehensive income																							28	28
Issued upon exercise of warrants (in shares)																			1,989,717
Balance (in shares) at Jul. 31, 2017																			139,815,124
Balance at Jul. 31, 2017																			$ 139,815	272,697,152	638,142	(227,325,002)	(14,702)	$ 46,135,405
Issued upon exercise of stock options (in shares)																			1,094,589					1,365,625
Issued upon exercise of stock options																			$ 1,095	528,955				$ 530,050
Issued upon exercise of warrants (in shares)																			61,799
Issued upon exercise of warrants																			$ 62	74,097				$ 74,159
Issued for credit facility (in shares)																			641,574					641,574
Issued for credit facility																			$ 641	899,359				$ 900,000
Issued for advance royalty payment (in shares)																			46,134
Issued for advance royalty payment																			$ 46	61,774				61,820
Issued for settlement of liabilities (in shares)																			565,499
Issued for settlement of liabilities																			$ 566	845,258				845,824
Common stock issued for consulting services (in shares)																			225,168
Common stock issued for consulting services																			$ 225	349,609				349,834
Common stock issued under Stock Incentive Plan (in shares)																			1,664,285
Common stock issued under Stock Incentive Plan																			$ 1,664	2,348,057	(638,142)			1,711,579
Amortization of stock option expenses																				1,414,629				1,414,629
Net loss for the year																						(17,826,634)		(17,826,634)
Other comprehensive income																							118,343	118,343
Issued upon exercise of warrants (in shares)																			61,799
Issued for acquisitions (in shares)	14,852,450					14,634,748	1,691,215					1,625,531	164,767					164,767
Issued for acquisitions	$ 14,853	$ 20,317,764				$ 20,332,617	$ 1,691	$ 2,721,165				$ 2,722,856	$ 165	$ 232,156				$ 232,321
Issued for Reimbursable Expenses for Reno Creek Acquisition (in shares)						353,160													353,160
Issued for Reimbursable Expenses for Reno Creek Acquisition																			$ 353	483,476				483,829
Issued in connection with Reno Creek Acquisition																				5,088,928				5,088,928
Balance (in shares) at Jul. 31, 2018																			161,175,764
Balance at Jul. 31, 2018																			$ 161,176	308,062,379		(245,151,636)	103,641	63,175,560
Issued for equity financing, net of issuance costs (in shares)																			12,613,049
Issued for equity financing, net of issuance costs																			$ 12,613	15,978,348				$ 15,990,961
Issued upon exercise of stock options (in shares)																			125,879					259,625
Issued upon exercise of stock options																			$ 126	72,237				$ 72,363
Issued upon exercise of warrants (in shares)																			3,999,881
Issued upon exercise of warrants																			$ 4,000	4,818,357				4,822,357
Issued for credit facility (in shares)																			1,180,328
Issued for credit facility																			$ 1,180	1,398,820				1,400,000
Common stock issued for consulting services (in shares)																			165,404
Common stock issued for consulting services																			$ 163	226,376				226,539
Common stock issued under Stock Incentive Plan (in shares)																			886,126
Common stock issued under Stock Incentive Plan																			$ 888	1,173,956	187,100			1,361,944
Amortization of stock option expenses																				1,359,558				1,359,558
Issued for equity financing																				2,978,250				2,978,250
Net loss for the year																						(17,152,789)		(17,152,789)
Other comprehensive income																							12,461	$ 12,461
Issued upon exercise of warrants (in shares)																			3,999,881
Issued in exchange of warrants pursuant to Securities Exchange Agreement (in shares)																			750,000					750,000
Issued in exchange of warrants pursuant to Securities Exchange Agreement																			$ 750	976,814				$ 977,564
Exchanged for common stock pursuant to Securities Exchange Agreement																				(4,950,000)				(4,950,000)
Difference from Securities Exchange Agreement																				3,952,500				3,952,500
Reclassification upon adoption of ASU No. 2016-01																						103,641	(103,641)
Balance (in shares) at Jul. 31, 2019																			180,896,431
Balance at Jul. 31, 2019																			$ 180,896	$ 336,047,595	$ 187,100	$ (262,200,784)	$ 12,461	$ 74,227,268