PROVISION FOR INCOME TAXES (Details) (USD $)	3 Months Ended			9 Months Ended
	Aug. 31, 2013	Feb. 28, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Income Taxes [Line Items]
Effective tax rate	27.00%		22.00%	22.00%	20.00%
Tax expense to adjust taxes provided for the prior year	$ 1,400,000		$ 1,600,000
Provision for income taxes	(7,900,000)		(7,400,000)	(10,900,000)	(17,900,000)
Income tax reconciliation, reconciling items				1,300,000
Tax benefit primarily related to expiration of statute of limitation					3,100,000
Forecasted annual tax rate				24.00%	17.00%
Reinstatement of tax credits for research		3,300,000
Increase in gross unrecognized tax benefits	24,200,000
Gross unrecognized tax benefits	85,400,000			85,400,000
Amount of unrecognized tax benefit that would benefit tax expense if realized	66,700,000			66,700,000
State
Income Taxes [Line Items]
Research and development credit carryforward				13,500,000
Operating loss carryforwards	4,800,000			4,800,000
Error Related to Tax Benefit | Restatement Adjustment
Income Taxes [Line Items]
Provision for income taxes	$ 2,200,000