Nature of Business and Basis Of Presentation Correction of Prior Period Amounts (Cash Flow) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011		Aug. 31, 2012	Aug. 31, 2011
Cash flows from operating activities:
Net income	$ 5,838	$ 9,059		$ 11,419	$ 47,454
Changes in operating assets and liabilities:
Income taxes payable and uncertain tax positions				(2,760)	11,093
As Previously Reported [Member]
Cash flows from operating activities:
Net income		8,601	[1]		47,081	[1]
Changes in operating assets and liabilities:
Income taxes payable and uncertain tax positions					11,466
Adjustment [Member]
Cash flows from operating activities:
Net income		458			373
Changes in operating assets and liabilities:
Income taxes payable and uncertain tax positions					$ (373)

[1] The condensed consolidated statements of income for the three and nine months ended August 31, 2011 have been revised to reflect the impact of discontinued operations (Note 6).