Summary of Non Vested Restricted Stock Award Changes During Period (Detail) (USD $)	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Restricted Stock Units (RSUs)
Number of Shares
Non-vested at beginning of the Period	161,000
Granted	0
Vested	0
Non-vested at end of the Period	161,000
Weighted Average Grant Date Fair Value Per Share
Non-vested at beginning of the Period	$ 15.47
Granted	$ 0.00	$ 15.08
Vested	$ 0.00
Non-vested at end of the Period	$ 15.47
Restricted Stock
Number of Shares
Non-vested at beginning of the Period	212,700
Granted	71,400
Vested	(67,300)
Non-vested at end of the Period	216,800
Weighted Average Grant Date Fair Value Per Share
Non-vested at beginning of the Period	$ 16.08
Granted	$ 21.09	$ 15.08
Vested	$ 16.21
Non-vested at end of the Period	$ 17.69