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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Nov. 30, 2012
Accounting Policies [Abstract]  
Basic and diluted loss per share
Basic and diluted loss per share were calculated as follows (in thousands, except per share amounts):
 
Years Ended November 30,
 
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
Net loss
$
(58,953
)
 
$
(178,768
)
 
$
(69,368
)
Denominator:
 
 
 
 
 
Basic and diluted average shares outstanding
77,106

 
77,043

 
76,889

Basic and diluted loss per share
$
(.76
)
 
$
(2.32
)
 
$
(.90
)