Long-Term Debt (Narrative) (Details) ¥ in Millions	12 Months Ended
	Jul. 31, 2015 JPY (¥)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Mar. 27, 2014 USD ($)
Debt Instrument [Line Items]
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 in 2019		13,300,000
Annual maturities of long-term debt in 2020		0
Annual maturities of long-term debt thereafter		275,000,000
Face value of debt issued		391,067,000	$ 245,464,000
Unsecured Senior Notes Six [Member]
Debt Instrument [Line Items]
Senior unsecured notes, issued		$ 125.0
Senior unsecured notes, due date	Jun. 17, 2030	Jun. 17, 2030
Senior unsecured notes, interest rate		3.18%
Long-term debt, principal payment		$ 125,000,000
Face value of debt issued		125,000,000
Unsecured Senior Notes Five [Member]
Debt Instrument [Line Items]
Senior unsecured notes, issued		$ 25.0
Senior unsecured notes, due date	Apr. 16, 2025	Apr. 16, 2025
Senior unsecured notes, interest rate		2.93%
Long-term debt, principal payment		$ 25,000,000
Face value of debt issued		$ 25,000,000
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]
Senior unsecured notes, issued				$ 125.0
Senior unsecured notes, due date	Mar. 27, 2024	Mar. 27, 2024
Senior unsecured notes, interest rate		3.72%		3.72%
Long-term debt, principal payment		$ 125,000,000
Face value of debt issued		$ 125,000,000	125,000,000
Five Point Four Eight Percent Unsecured Senior Notes Due September Twenty Eight Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Senior unsecured notes, due date	Sep. 28, 2017	Sep. 28, 2017
Senior unsecured notes, interest rate		5.48%
Long-term debt, principal payment		$ 25,000,000
Face value of debt issued		$ 25,000,000	25,000,000
Five Point Four Eight Percent Unsecured Senior Notes Due November Thirty Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Senior unsecured notes, due date	Nov. 30, 2017	Nov. 30, 2017
Senior unsecured notes, interest rate		5.48%
Long-term debt, principal payment		$ 25,000,000
Face value of debt issued		$ 25,000,000	25,000,000
Five Point Four Eight Percent Unsecured Senior Notes Due June One Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Senior unsecured notes, due date	Jun. 01, 2017	Jun. 01, 2017
Senior unsecured notes, interest rate		5.48%
Long-term debt, principal payment		$ 50,000,000
Face value of debt issued		$ 50,000,000	50,000,000
Variable Rate Guaranteed Senior Note Due May Nineteen Two Thousand Nineteen [Member]
Debt Instrument [Line Items]
Senior unsecured notes, due date	May 19, 2019	May 19, 2019
Senior unsecured notes, interest rate		0.52%
Long-term debt, principal payment | ¥	¥ 1,650
Face value of debt issued		$ 13,300,000	16,051,000
Capitalized Lease Obligations And Other With Various Maturity Dates And Interest Rates [Member]
Debt Instrument [Line Items]
Face value of debt issued		1,928,000	3,177,000
Terminated Interest Rate Swap Contract [Member]
Debt Instrument [Line Items]
Face value of debt issued		$ 826,000	$ 1,236,000