Nature Of Business And Summary Of Significant Accounting Policies (Correction of Prior Period Amounts (Balance Sheet)) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Assets:
Other current assets	$ 16,478	$ 22,110
Deferred tax assets	16,301	13,458
Total current assets	526,818	407,911
Goodwill	226,110	256,211	236,730
Total assets	884,977	864,263
Liabilities and shareholders' equity:
Income taxes payable	21,486	6,048
Total current liabilities	240,154	226,144
Other noncurrent liabilities	2,575	4,857
Retained earnings	348,830	327,542	350,409	312,588
Accumulated other comprehensive loss, net of tax	(10,764)	(11,653)	(7,739)	(1,986)
Total shareholders’ equity	638,399	625,110	690,273	557,867
Total liabilities and shareholders’ equity	884,977	864,263
As Previously Reported [Member]
Assets:
Other current assets		21,143
Deferred tax assets		14,291
Total current assets		407,777
Goodwill		263,239
Total assets		865,310
Liabilities and shareholders' equity:
Income taxes payable		11,412
Total current liabilities		231,508
Other noncurrent liabilities		3,350
Retained earnings		326,135	349,870	311,576
Accumulated other comprehensive loss, net of tax		(13,056)	(9,142)	(3,389)
Total shareholders’ equity		622,300	688,331	555,452
Total liabilities and shareholders’ equity		865,310
Purchase Price Allocation Adjustments [Member]
Assets:
Other current assets		0
Deferred tax assets		0
Total current assets		0
Goodwill		(5,415)
Total assets		432
Liabilities and shareholders' equity:
Income taxes payable		0
Total current liabilities		0
Other noncurrent liabilities		432
Retained earnings		0
Accumulated other comprehensive loss, net of tax		0
Total shareholders’ equity		0
Total liabilities and shareholders’ equity		432
Adjustment [Member]
Assets:
Other current assets		967
Deferred tax assets		(833)
Total current assets		134
Goodwill		(1,613)
Total assets		(1,479)
Liabilities and shareholders' equity:
Income taxes payable		(5,364)
Total current liabilities		(5,364)
Other noncurrent liabilities		1,075
Retained earnings		1,407	539	1,012
Accumulated other comprehensive loss, net of tax		1,403	1,403	1,403
Total shareholders’ equity		2,810	1,942	2,415
Total liabilities and shareholders’ equity		$ (1,479)