Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Oct. 31, 2012
Reconciliation of Company's effective tax rate from federal statutory rate
Federal tax (benefit) provision at statutory rate	$ 14,339	$ 5,477	$ 17,253	$ 3,234
State taxes, net of federal benefit	1,705	662	2,051	391
Increase in unrecognized tax benefits		(1,223)		277
Reversal of accrual for uncertain tax positions				(5,279)
Income Tax Reconciliation Increase in Deferred Tax Assets Net		(1,575)		(2,100)
Valuation allowance - reversed	(1,061)	(4,564)	(1,277)	(3,318)	(394,718)
Accrued interest on anticipated tax assessments	817		1,982	1,950
Other	494		179
Income tax provision (benefit)	$ 16,294	$ (1,223)	$ 20,188	$ (4,845)
Federal tax (benefit) provision at statutory rate, percentage	35.00%	35.00%	35.00%	35.00%
State taxes net of federal benefit, percentage	4.20%	4.20%	4.20%	4.20%
Effective Income Tax Rate Reconciliation Increase In Unrecognized Tax Benefit		(7.80%)		3.00%
Reversal of accrual for uncertain tax positions, percentage				(57.10%)
Effective Income Tax Rate Reconciliation In Deferred Tax Assets		(10.00%)		(22.70%)
Valuation allowance - reversed, percentage	(2.60%)	(29.20%)	(2.60%)	(35.90%)
Accrued interest on anticipated tax assessments, percentage	2.00%		4.00%	21.10%
Other, percentage	1.20%		0.40%
Tax provision (benefit), percentage	39.80%	(7.80%)	41.00%	(52.40%)