Valuation Allowances and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Allowance for Doubtful Accounts & Returned Goods [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		$ 722	$ 495	$ 319
Charges to Cost and Expenses		113	338	207
Charges to Other Accounts	[1]	(75)	0	0
Deduction from Reserves		60	111	31
Balance at End of Year		700	722	495
Allowance for Excess and Obsolete Inventory [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		2,217	1,834	466
Charges to Cost and Expenses		454	383	1,368
Charges to Other Accounts	[1]	(4)	0	0
Deduction from Reserves		0	0	0
Balance at End of Year		$ 2,667	$ 2,217	$ 1,834

[1] Represents foreign subsidiary financial statement translation impact charged to other comprehensive income.