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, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income from continuing operations	$ 16,076	$ 12,626	$ 48,732	$ 35,013
Loss from discontinued operations, net of taxes		(49)		(94)
Net income	$ 16,076	$ 12,577	$ 48,732	$ 34,919
Weighted-average common and common equivalent shares outstanding-Basic	54,950	54,145	54,727	53,863
Effect of dilutive securities:
Weighted-average common and common equivalent shares outstanding-Diluted	56,281	55,000	55,861	54,819
Net income per common share
Basic	$ 0.29	$ 0.23	$ 0.89	$ 0.65
Diluted	$ 0.29	$ 0.23	$ 0.87	$ 0.64
RSUs
Effect of dilutive securities:
Effect of dilutive securities	520	363	463	367
Performance shares
Effect of dilutive securities:
Effect of dilutive securities	444	250	383	269
Stock options
Effect of dilutive securities:
Effect of dilutive securities	367	242	288	320