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Stock-based Payment Compensation (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Oct. 31, 2018 | Oct. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation | $ 6,021 | $ 5,306
General and administrative |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation | 4,989 | 4,454
Yard Operations |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation | $ 1,032 | $ 852

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