Property and Equipment at Stock (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012		Jan. 31, 2012		Oct. 31, 2011		Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2011		Oct. 31, 2010		Jul. 31, 2010		Apr. 30, 2010		Jan. 31, 2010		Oct. 31, 2009
Property, Plant and Equipment [Line Items]
Buildings	$ 20,299	[1]					$ 23,833	[1]							$ 20,350	[1]
Machinery and equipment	18,565	[1]					22,122	[1]							24,245	[1]
Less: Accumulated amortization	(51,713)						(49,911)								(30,437)
Net property and equipment, at cost	40,772	[1]	43,493	[1]	44,807	[1]	47,403	[1]	50,052	[1]	50,072	[1]	52,353	[1]	53,061	[1]	55,025	[1]	56,529	[1]	59,134	[1]
Capital Lease [Member]
Property, Plant and Equipment [Line Items]
Buildings															3,734	[1]
Machinery and equipment	445	[1]					449	[1]							411	[1]
Other							46	[1]							46	[1]
Less: Accumulated amortization	(275)	[1]					(284)	[1]							(3,937)	[1]
Net property and equipment, at cost	$ 170	[1]					$ 211	[1]							$ 254	[1]

[1] As Restated