Annual report pursuant to Section 13 and 15(d)

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts

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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Allowance for Doubtful Accounts [Member]      
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts [Line Items]      
Balance at Beginning of period $ 3,576 $ 3,517 $ 1,786
Charged (credited) to costs and expenses 3,690 2,775 2,336
Deductions [1] 4,598 2,716 605
Balance at end of period 2,668 3,576 3,517
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts [Line Items]      
Balance at Beginning of period 32,581 34,912 49,658
Charged (credited) to costs and expenses (8,110) (2,331) (14,746)
Balance at end of period $ 24,471 $ 32,581 $ 34,912
[1] Write-off of uncollectible accounts receivable.