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Basis of Presentation and Significant Accounting Policies (Tables)
 9 Months Ended
Aug. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Basic and Diluted Loss Per Share
Basic and diluted earnings (loss) per share were calculated as follows (in thousands, except per share amounts): 
 
Nine Months Ended August 31,
 
Three Months Ended August 31,
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
(66,677
)
 
$
(192,679
)
 
$
3,261

 
$
(9,649
)
Denominator:
 
 
 
 
 
 
 
Basic average shares outstanding
77,107

 
77,004

 
77,127

 
77,047

Net effect of stock options assumed to be exercised
—

 
—

 
231

 
—

Diluted average shares outstanding
77,107

 
77,004

 
77,358

 
77,047

Basic earnings (loss) per share
$
(.86
)
 
$
(2.50
)
 
$
.04

 
$
(.13
)
Diluted earnings (loss) per share
$
(.86
)
 
$
(2.50
)
 
$
.04

 
$
(.13
)