Long-Term Debt (Schedule Of Long-Term Debt) (Details)	0 Months Ended						12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Jan. 21, 2012 USD ($)	Jan. 21, 2012 JPY (¥)	Dec. 17, 2011 USD ($)	Jul. 31, 2012 USD ($)	Jan. 03, 2012	Jul. 31, 2011 USD ($)	Jul. 31, 2012 4.85% Unsecured Senior Notes Due December 17, 2011 [Member]	Jul. 31, 2011 4.85% Unsecured Senior Notes Due December 17, 2011 [Member] USD ($)	Jul. 31, 2012 6.59% Unsecured Senior Notes Due November 14, 2013 [Member] USD ($)	Jul. 31, 2011 6.59% Unsecured Senior Notes Due November 14, 2013 [Member] USD ($)	Jul. 31, 2012 5.48% Unsecured Senior Notes Due June 1, 2017 [Member] USD ($)	Jul. 31, 2011 5.48% Unsecured Senior Notes Due June 1, 2017 [Member] USD ($)	Jul. 31, 2012 5.48% Unsecured Senior Notes Due September 28, 2017 [Member] USD ($)	Jul. 31, 2011 5.48% Unsecured Senior Notes Due September 28, 2017 [Member] USD ($)	Jul. 31, 2012 5.48% Unsecured Senior Notes Due November 30, 2017 [Member] USD ($)	Jul. 31, 2011 5.48% Unsecured Senior Notes Due November 30, 2017 [Member] USD ($)	Jul. 31, 2012 1.418% Guaranteed Senior Notes Due January 31, 2012 [Member]	Jul. 31, 2011 1.418% Guaranteed Senior Notes Due January 31, 2012 [Member] USD ($)	Jul. 31, 2012 2.019% Guaranteed Senior Note Due May 18, 2014 [Member] JPY (¥)	Jul. 31, 2012 2.019% Guaranteed Senior Note Due May 18, 2014 [Member] USD ($)	Jul. 31, 2011 2.019% Guaranteed Senior Note Due May 18, 2014 [Member] USD ($)	Jul. 31, 2012 Capitalized Lease Obligations and Other, with Various Maturity Dates and Interest Rates [Member] USD ($)	Jul. 31, 2011 Capitalized Lease Obligations and Other, with Various Maturity Dates and Interest Rates [Member] USD ($)	Jul. 31, 2012 Terminated Interest Rate Swap Contract [Member] USD ($)	Jul. 31, 2011 Terminated Interest Rate Swap Contract [Member] USD ($)
Short-term Debt [Line Items]
Total				$ 205,829,000		$ 253,619,000		$ 30,000,000	$ 80,000,000	$ 80,000,000	$ 50,000,000	$ 50,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 25,000,000		$ 15,595,000		$ 21,117,000	$ 21,442,000	$ 774,000	$ 796,000	$ 3,938,000	$ 5,786,000
Less current maturities				2,346,000		47,871,000
Total long-term debt				203,483,000		205,748,000
Interest rate percentage			4.85%		1.418%		4.85%		6.59%		5.48%		5.48%		5.48%		1.418%			2.019%
Senior unsecured notes, due date							Dec. 17, 2011		Nov. 14, 2013		Jun. 01, 2017		Sep. 28, 2017		Nov. 30, 2017		Jan. 31, 2012		May 18, 2014
Long-term debt, principal payment	$ 15,400,000	¥ 1,200,000,000	$ 30,000,000						$ 80,000,000		$ 50,000,000		$ 25,000,000		$ 25,000,000				¥ 1,650,000,000