Concentration of Credit Risk - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended	3 Months Ended
	Jan. 31, 2014	Jan. 31, 2014 Sales Revenue, Goods, Net	Jan. 31, 2013 Sales Revenue, Goods, Net	Jan. 31, 2014 Accounts Receivable	Oct. 31, 2013 Accounts Receivable	Jan. 31, 2014 Optiflex Customer Concentration Risk	Jan. 31, 2013 Optiflex Customer Concentration Risk
Concentration Risk [Line Items]
Cash, FDIC insured amount	$ 12.4
Concentration risk, percentage		35.00%	53.00%	24.00%	27.00%	18.00%	34.00%
Concentration agreement with major customer	15 years
Sales revenue, goods, net						$ 1.1	$ 3.6