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Secured Credit Facility (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 23, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015 | Jul. 31, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |
Current portion of long-term debt |  | $ 14,062,000 |  | $ 14,062,000 |  | $ 0
Non-current portion of long-term debt, net |  | 328,486,000 |  | 328,486,000 |  | $ 0
Secured Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term Debt |  | 342,548,000 |  | 342,548,000 |  |
Current portion of long-term debt |  | 14,062,000 |  | 14,062,000 |  |
Non-current portion of long-term debt, net |  | 328,486,000 |  | 328,486,000 |  |
Line of Credit Facility, maximum borrowing capacity | $ 400,000,000 |  |  |  |  |
Interest expense related to Credit Facility |  | $ 2,981,000 |  | $ 2,981,000 |  |
Weighted interest rate (percent) |  | 5.00% |  | 5.00% |  |
Outstanding standby letters of credit at period end |  | $ 2,352,000 |  | $ 2,352,000 |  |
Outstanding commercial letters of credit at period end |  | 0 |  | 0 |  |
Amount of potential further loan syndication | 15,000,000 |  |  |  |  |
Committed Secured Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, maximum borrowing capacity |  |  | $ 100,000,000 |  | $ 100,000,000 |
Interest expense related to Credit Facility |  |  | $ 0 |  | $ 198,000 |
Term Loan Facility [Member] | Secured Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | 246,875,000 |  | 246,875,000 |  |
Unamortized deferred financing costs |  | 6,231,000 |  | 6,231,000 |  |
Long-term Debt |  | 240,644,000 |  | 240,644,000 |  |
Line of Credit Facility, maximum borrowing capacity | 250,000,000 |  |  |  |  |
Revolving Loan Facility [Member] | Secured Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term Debt |  | $ 101,904,000 |  | $ 101,904,000 |  |
Line of Credit Facility, maximum borrowing capacity | 150,000,000 |  |  |  |  |
Revolving Loan Facility [Member] | Letter of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, maximum borrowing capacity | $ 25,000,000 |  |  |  |  |
Federal Funds Rate [Member] | Revolving Loan Facility [Member] | Secured Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Variable interest rate (percent) |  |  |  | 0.50% |  |
Adjusted LIBO rate | Revolving Loan Facility [Member] | Secured Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Variable interest rate (percent) |  |  |  | 1.00% |  |
Floor interest rate |  |  |  | 1.00% |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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