Long-Term Debt (Narrative) (Details)			12 Months Ended		12 Months Ended		12 Months Ended
	Jul. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)	Jul. 31, 2014 3.72% Unsecured Senior Notes Due March 27, 2024 [Member] USD ($)	Mar. 27, 2014 3.72% Unsecured Senior Notes Due March 27, 2024 [Member] USD ($)	Jul. 31, 2014 2.019% Guaranteed Senior Note Due May 18, 2014 [Member] JPY (¥)	Jul. 31, 2013 2.019% Guaranteed Senior Note Due May 18, 2014 [Member] USD ($)	Jul. 31, 2014 Variable Rate Guaranteed Senior Note Due May 19, 2019 [Member] JPY (¥)	Jul. 31, 2014 Variable Rate Guaranteed Senior Note Due May 19, 2019 [Member] USD ($)
Debt Instrument [Line Items]
Annual maturities of long-term debt in 2015	$ 1,700,000
Annual maturities of long-term debt in 2016	1,800,000
Annual maturities of long-term debt in 2017	50,800,000
Annual maturities of long-term debt in 2018	50,100,000
Annual maturities of long-term debt thereafter	141,100,000
Senior unsecured notes, issued				125,000,000
Senior unsecured notes, due date			Mar. 27, 2024		May 18, 2014		May 19, 2019
Senior unsecured notes, interest rate			3.72%	3.72%	2.019%			0.56%
Long-term debt, principal payment			125,000,000		1,650,000,000		1,650,000,000
Face value of debt issued	$ 245,464,000	$ 201,438,000	$ 125,000,000			$ 16,848,000		$ 16,051,000