Accrued Expenses and Other Current Liabilities (Accrued Business Acquisition Payments) (Details) (USD $)	3 Months Ended				39 Months Ended		3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2012 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2013 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2010 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2013 Technologies [Member]	Jul. 31, 2013 Technologies [Member]	Oct. 31, 2013 Technologies [Member] Acquisition of Stampede Technologies, Inc. [Member]
Business Acquisition [Line Items]
Effective date of acquisition					Oct. 01, 2010
Aggregate purchase price						$ 5,303,000
Finite-lived intangible asset, useful life							11 years 8 months 12 days	11 years 8 months 12 days	5 years
Business acquisition, contingent consideration, at fair value			43,000		43,000	3,803,000
Benefit related to a change in fair value of contingent earn-out liability	239,000	2,378,000	239,000	2,378,000
Business acquisition contingent consideration interest accretion expense			0	108,000	986,000
Purchase price paid in cash as of the balance sheet date			1,822,000		1,822,000
Payment of contingent consideration related to business acquisition	$ 6,000	$ 1,000			$ 322,000