Schedule I Parent Only Balance Sheets, Statements Of Earnings And Cash Flows (Balance Sheets) (Parenthetical) (Details)	Jul. 31, 2013	Jul. 31, 2012
Common unitholders, units outstanding	79,072,819	79,006,619
General partner unitholder, units outstanding	798,715	798,047
Parent Company [Member]
Common unitholders, units outstanding	79,072,819	79,006,619
General partner unitholder, units outstanding	798,715	798,047