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Commitments and Contingencies (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Major Operating and Capital Expenses [Abstract] |  |  |
Outstanding letter of credit | $ 15.8 |  |
Facilities Rental Expense |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |
Rental expense | 26.8 | $ 21.6 | $ 21.7
Yard Operations Equipment Rental Expense |  |  |
Major Operating and Capital Expenses [Abstract] |  |  |
Rental expense | $ 2.9 | $ 3.1 | $ 3.6

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Details
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- Details
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