Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data	3 Months Ended	9 Months Ended
Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2011	Aug. 31, 2010
Basic and diluted:
Income from continuing operations	$ 9,650	$ 3,609	$ 42,958	$ 39,358
Loss from discontinued operations				(47)
Net income	$ 9,650	$ 3,609	$ 42,958	$ 39,311
Basic earnings per share denominator:
Weighted average shares outstanding	47,520,734	48,164,600	47,781,307	48,194,160
Basic earnings per share:
Income from continuing operations	$ 0.20	$ 0.08	$ 0.90	$ 0.82
Loss from discontinued operations				$ 0.00
Net income	$ 0.20	$ 0.08	$ 0.90	$ 0.82
Diluted earnings per share denominator:
Weighted average shares outstanding	47,520,734	48,164,600	47,781,307	48,194,160
Common stock options	10,976	4,106	9,311	2,355
Diluted weighted average shares outstanding	47,531,710	48,168,706	47,790,618	48,196,515
Diluted earnings per share:
Income from continuing operations	$ 0.20	$ 0.08	$ 0.90	$ 0.82
Loss from discontinued operations				$ 0.00
Net income	$ 0.20	$ 0.08	$ 0.90	$ 0.82
Anti-dilutive shares excluded in the computation of diluted earnings per share	250,476	275,572	258,579	269,020

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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