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Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2017 | [1] | Jul. 31, 2016 | Jul. 31, 2015
Reserves deducted from accounts receivable: |  |  |  |  |
Allowance for doubtful accounts, Balance at beginning of year | $ 4,818 | $ 5,645 |  | $ 11,507 |
Allowance for doubtful accounts, Additions charged to costs and expenses | 686 | 1,519 |  | 97 |
Allowance for doubtful accounts, Deductions | (297) | (2,346) | [2] | (5,959) | [2]
Allowance for doubtful accounts, Balance at end of year | $ 5,207 | $ 4,818 | [1] | $ 5,645 |
[1] | Includes allowance for doubtful accounts of $2,550 and $861 held for sale at July 31, 2017 and 2016, respectively (see Note 3)
[2] | Primarily uncollectible accounts written off, net of recoveries.

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