Long-Term Debt (Schedule Of Long-Term Debt) (Details) $ in Thousands, ¥ in Millions	12 Months Ended
	Jul. 31, 2015 JPY (¥)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Mar. 27, 2014
Debt Instrument [Line Items]
Total		$ 391,067	$ 245,464
Less current maturities		1,849	1,738
Total long-term debt		389,218	243,726
Unsecured Senior Notes Six [Member]
Debt Instrument [Line Items]
Total		$ 125,000
Interest rate percentage		3.18%
Senior unsecured notes, due date	Jun. 17, 2030	Jun. 17, 2030
Long-term debt, principal payment		$ 125,000
Unsecured Senior Notes Five [Member]
Debt Instrument [Line Items]
Total		$ 25,000
Interest rate percentage		2.93%
Senior unsecured notes, due date	Apr. 16, 2025	Apr. 16, 2025
Long-term debt, principal payment		$ 25,000
Two Point Zero One Nine Percent Guaranteed Senior Note Due May Eighteen Two Thousand Fourteen [Member]
Debt Instrument [Line Items]
Senior unsecured notes, due date	May 18, 2014	May 18, 2014
Long-term debt, principal payment | ¥	¥ 1,650
Three Point Seven Two Percent Unsecured Senior Notes Due March Twenty Seven Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Total		$ 125,000	125,000
Interest rate percentage		3.72%		3.72%
Senior unsecured notes, due date	Mar. 27, 2024	Mar. 27, 2024
Long-term debt, principal payment		$ 125,000
Five Point Four Eight Percent Unsecured Senior Notes Due September Twenty Eight Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Total		$ 25,000	25,000
Interest rate percentage		5.48%
Senior unsecured notes, due date	Sep. 28, 2017	Sep. 28, 2017
Long-term debt, principal payment		$ 25,000
Five Point Four Eight Percent Unsecured Senior Notes Due November Thirty Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Total		$ 25,000	25,000
Interest rate percentage		5.48%
Senior unsecured notes, due date	Nov. 30, 2017	Nov. 30, 2017
Long-term debt, principal payment		$ 25,000
Five Point Four Eight Percent Unsecured Senior Notes Due June One Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Total		$ 50,000	50,000
Interest rate percentage		5.48%
Senior unsecured notes, due date	Jun. 01, 2017	Jun. 01, 2017
Long-term debt, principal payment		$ 50,000
Variable Rate Guaranteed Senior Note Due May Nineteen Two Thousand Nineteen [Member]
Debt Instrument [Line Items]
Total		$ 13,300	16,051
Interest rate percentage		0.52%
Senior unsecured notes, due date	May 19, 2019	May 19, 2019
Long-term debt, principal payment | ¥	¥ 1,650
Terminated Interest Rate Swap Contract [Member]
Debt Instrument [Line Items]
Total		$ 826	1,236
Capitalized Lease Obligations And Other With Various Maturity Dates And Interest Rates [Member]
Debt Instrument [Line Items]
Total		$ 1,928	$ 3,177