Segment Information Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Segment Reporting Information [Line Items]
Total net revenue	$ 209,124	$ 794,631	$ 725,198	$ 178,265	$ 179,884	$ 647,472	$ 599,363	$ 174,567	$ 1,907,218	$ 1,601,286	$ 1,399,924
Property, Plant and Equipment, Net	1,714,154				1,363,814				1,714,154	1,363,814
Canadian [Member]
Segment Reporting Information [Line Items]
Total net revenue									257,800
Property, Plant and Equipment, Net	338,800								338,800
Geographic Distribution, Foreign [Member]
Segment Reporting Information [Line Items]
Total net revenue									328,942	66,570	24,734
Property, Plant and Equipment, Net	453,933				115,977				453,933	115,977
Geographic Distribution, Domestic [Member]
Segment Reporting Information [Line Items]
Total net revenue									1,578,276	1,534,716	$ 1,375,190
Property, Plant and Equipment, Net	$ 1,260,220				$ 1,247,838				$ 1,260,220	$ 1,247,838