Intangible Assets (Details) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		15 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Jul. 31, 2011	Oct. 31, 2011 Technologies [Member]	Jul. 31, 2011 Technologies [Member]	Oct. 31, 2011 Customer relationships [Member]	Jul. 31, 2011 Customer relationships [Member]	Oct. 31, 2011 Trademarks and other [Member]	Jul. 31, 2011 Trademarks and other [Member]	Oct. 31, 2011 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2010 Acquisition of Stampede Technologies, Inc. [Member]	Oct. 31, 2011 Acquisition of Stampede Technologies, Inc. [Member]
Weighted Average Amortization Period				10.3	10.2	10.0	10.0	18.6	18.6
Gross Carrying Amount	$ 83,669,000		$ 83,669,000	$ 47,694,000	$ 47,694,000	$ 29,931,000	$ 29,931,000	$ 6,044,000	$ 6,044,000
Accumulated Amortization	39,918,000		38,199,000	27,875,000	27,000,000	10,020,000	9,281,000	2,023,000	1,918,000
Net Carrying Amount	43,751,000		45,470,000	19,819,000	20,694,000	19,911,000	20,650,000	4,021,000	4,126,000
Effective date of acquisition											October 2010
Name of acquired entity											Stampede Technologies, Inc.
Aggregate purchase price											5,303,000
Fair value of contingent consideration arrangement											3,803,000
Term, in years, of contingent consideration arrangement											3
Business acquisition purchase price paid												1,587,000
Payment of contingent consideration related to business acquisition												87,000
Business acquisition, contingent consideration at fair value, noncurrent										3,316,000		3,316,000
Business acquisition, contingent consideration at fair value, current	913,000		726,000							913,000		913,000
Business acquisition, contingent consideration at fair value, accretion expense										122,000	38,000	513,000
Useful life of technologies acquired, in years										5
Amortization Expense	1,719,000	1,887,000
Amortization Expense - Current Fiscal Year	6,637,000
Amortization Expense - Year Two	6,327,000
Amortization Expense - Year Three	6,285,000
Amortization Expense - Year Four	6,211,000
Amortization Expense - Year Five	$ 4,962,000