Stock-Based Benefit Plans (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012 Performance Based Restricted Stock Units [Member]	Apr. 30, 2012 Performance Based Restricted Stock Units [Member]	Dec. 20, 2011 Performance Based Restricted Stock Units [Member]
Performance-Based Restricted Stock Units
Issuance of restricted stock and stock units, shares						360,000
Closing price of the Company's common stock on date of issuance							$ 20.50
Stock based expense recognized	$ 3,205	$ 2,345	$ 8,831	$ 7,717	$ 984	$ 1,920
Unamortized value of performance-based RSUs					5,452	5,452
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures						$ 7,371