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Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Reserves deducted from accounts receivable:      
Allowance for doubtful accounts, Balance at beginning of year $ 5,207 [1] $ 4,818 [1] $ 5,645
Allowance for doubtful accounts, Additions charged to costs and expenses 2,199 [1] 686 [1] 1,519
Allowance for doubtful accounts, Deductions [2] (2,048) [1] (297) [1] (2,346)
Allowance for doubtful accounts, Balance at end of year [1] $ 5,358 $ 5,207 $ 4,818
[1] Includes allowance for doubtful accounts of $2.2 million and $2.6 million held for sale at July 31, 2018 and 2017, respectively (see Note 3)
[2] Primarily uncollectible accounts written off, net of recoveries.