Accrued Expenses and Other Current Liabilities (Accrued Business Acquisition Payments) (Details) (USD $)	9 Months Ended			3 Months Ended		9 Months Ended		33 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Jul. 31, 2012	Apr. 30, 2013 Acquisition of Stampede Technologies, Inc. [Member]	Apr. 30, 2012 Acquisition of Stampede Technologies, Inc. [Member]	Apr. 30, 2013 Acquisition of Stampede Technologies, Inc. [Member]	Apr. 30, 2012 Acquisition of Stampede Technologies, Inc. [Member]	Apr. 30, 2013 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2010 Acquisition of Stampede Technologies, Inc. [Member]
Effective date of acquisition						Oct. 01, 2010
Aggregate purchase price									$ 5,303,000
Finite-lived intangible asset, useful life						5 years
Business acquisition, contingent consideration, at fair value	307,000		3,519,000	307,000		307,000		307,000
Contingent earn-out period end date						Oct. 01, 2013
Benefit related to a change in fair value of contingent earn-out liability	3,267,000	844,000			844,000	3,267,000	844,000
Business acquisition, contingent consideration at fair value, current	307,000		1,752,000
Business acquisition contingent consideration interest accretion expense				0	116,000	133,000	357,000	986,000
Purchase price paid in cash as of the balance sheet date				1,797,000		1,797,000		1,797,000
Payment of contingent consideration related to business acquisition	$ 78,000	$ 163,000						$ 297,000