Company's Interest Rate Swap Contracts on Consolidated Financial Statements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amount of loss recognized in AOCI on derivative	$ 445	$ (39)	$ 406	$ (11)
Interest Expense
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amount of loss reclassified from AOCI into income	100	40	143	79
Interest Rate Swap
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amount of loss recognized in AOCI on derivative	$ 545	$ 1	$ 549	$ 68