Non-controlling interest - Non-controlling interest (Details)	6 Months Ended
	Oct. 31, 2015 USD ($)
Non–controlling interest at beginning of period	$ 3,644,776
Contribution of real estate by of non-controlling interest holders	9,403,368
Non–controlling interest share of income (losses)	3,042,130
Non–controlling interest at end of period	16,090,274
Bandolier [Member]
Non–controlling interest at beginning of period	$ 3,644,776
Contribution of real estate by of non-controlling interest holders
Non–controlling interest share of income (losses)	$ (154,987)
Non–controlling interest at end of period	$ 3,489,789
Fortis [Member]
Non–controlling interest at beginning of period
Contribution of real estate by of non-controlling interest holders	$ 9,403,368
Non–controlling interest share of income (losses)	3,197,117
Non–controlling interest at end of period	$ 12,600,485