SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts - USD ($) $ in Thousands		12 Months Ended
		Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
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		$ 1,786	$ 2,142	$ 2,707
Charged to costs and expenses		2,336	2,284	3,063
Deductions	[1]	605	2,640	3,628
Balance at end of period		3,517	1,786	2,142
Valuation Allowance of Deferred Tax Assets [Member]
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts [Line Items]
Balance at Beginning of period		49,658	49,465	47,623
Charged to costs and expenses		(14,746)	193	1,842
Balance at end of period		$ 34,912	$ 49,658	$ 49,465

[1] Write-off of uncollectible accounts receivable.