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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 |

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