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Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Reserves deducted from accounts receivable:      
Allowance for doubtful accounts, Balance at beginning of year $ 11,507 $ 13,079 $ 13,044
Allowance for doubtful accounts, Additions charged to costs and expenses 97 500 2,743
Allowance for doubtful accounts, Deductions [1] (5,959) (2,072) (2,708)
Allowance for doubtful accounts, Balance at end of year $ 5,645 $ 11,507 $ 13,079
[1] Primarily uncollectible accounts written off, net of recoveries.