Schedule I Parent Only Balance Sheets, Statements Of Earnings And Cash Flows (Balance Sheets) (Parenthetical) (Details) - shares	Jul. 31, 2017	Jul. 31, 2016
Common unitholders, units outstanding	97,152,665	98,002,665
General partner unitholder, units outstanding	989,926	989,926
Parent Company [Member]
Common unitholders, units outstanding	0	98,002,665
General partner unitholder, units outstanding	0	989,926