Calculations of Basic and Diluted Net Income Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income from continuing operations	$ 12,626	$ 27,911	$ 35,013	$ 50,516
Loss from discontinued operations, net of taxes	(49)	(36)	(94)	(60)
Net income	$ 12,577	$ 27,875	$ 34,919	$ 50,456
Weighted-average common and common equivalent shares outstanding-Basic	54,145	53,207	53,863	53,051
Effect of dilutive securities:
Weighted-average common and common equivalent shares outstanding-Diluted	55,000	54,201	54,819	54,084
Net income per common share
Basic	$ 0.23	$ 0.52	$ 0.65	$ 0.95
Diluted	$ 0.23	$ 0.51	$ 0.64	$ 0.93
Stock options
Effect of dilutive securities:
Effect of dilutive securities	242	466	320	539
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities	363	282	367	284
Performance shares
Effect of dilutive securities:
Effect of dilutive securities	250	246	269	210