Accrued Liabilities (Details) (USD $)	3 Months Ended	12 Months Ended
	Apr. 30, 2011	Oct. 31, 2013	Oct. 31, 2012
Accrued Liabilities, Current [Abstract]
Accrued Payroll and Employee Benefits		$ 4,647,000	$ 3,907,000
Accrued Contract and Operating Costs		87,000	39,000
Product Warranty Accrual		860,000	2,317,000
Reserve for Service Agreement Costs		4,186,000	7,222,000
Reserve for Repair and Upgrade Program		7,267,000	4,753,000
Other Accrued Liabilities, Current		4,865,000	2,027,000
Accrued Liabilities, Current		21,912,000	20,265,000
Product Warranty Accrual, Warranties Issued		1,200,000	3,100,000
Product Warranty Accrual, Payment and Adjustments		300,000	1,900,000
Loss Reserve on Service Agreements		3,700,000	5,000,000
Reserve for Performance Guarantees		500,000	2,200,000
Charge for Repair and Upgrade	$ 8,800,000