Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	12 Months Ended
	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.