Warrants to purchase common stock outstanding - Stockholders' (Deficiency)/Equity (Details) - $ / shares	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Number of Shares To be Purchased	383,877,521	512,911,037
Warrant Expiration Date 30 September 2016
Number of Shares To be Purchased	54,545,440
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Sep. 30, 2016
Warrant Expiration Date 1 February 2017
Number of Shares To be Purchased	11,350,454
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Feb. 01, 2017
Warrant Expiration Date 10 August 2017
Number of Shares To be Purchased	9,999,998
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Aug. 10, 2017
Warrant Expiration Date 12 December 2017
Number of Shares To be Purchased	16,648,288
Warrant Expiration Date 12 December 2017
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Dec. 12, 2017
Warrant Expiration Date 17 June 2018
Number of Shares To be Purchased	68,333,338
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Jun. 17, 2018
Warrant Expiration Date 15 January 2019
Number of Shares To be Purchased	51,333,336
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Jan. 15, 2019
Warrant Expiration Date 27 March 2019
Number of Shares To be Purchased	138,333,334
Warrant Exercise Price per Share	$ 0.015
Warrant Expiration Date	Mar. 27, 2019
Warrant Expiration Date 25 June 2019
Number of Shares To be Purchased	33,333,333
Warrant Exercise Price per Share	$ 0.015