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Basis of Presentation and Significant Accounting Policies (Tables)
 9 Months Ended
Aug. 31, 2013
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,
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
11,847

 
$
(66,677
)
 
$
27,278

 
$
3,261

Less: Distributed earnings allocated to nonvested restricted stock
(18
)
 
—

 
(6
)
 
(8
)
Less: Undistributed earnings allocated to nonvested restricted stock
(16
)
 
—

 
(73
)
 
(5
)
Numerator for basic earnings (loss) per share
11,813

 
(66,677
)
 
27,199

 
3,248

Effect of dilutive securities:
 
 
 
 
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
—

 
—

 
667

 
—

Add: Undistributed earnings allocated to nonvested restricted stock
16

 
—

 
73

 
5

Less: Undistributed earnings reallocated to nonvested restricted stock
(14
)
 
—

 
(65
)
 
(4
)
Numerator for diluted earnings (loss) per share
$
11,815

 
$
(66,677
)
 
$
27,874

 
$
3,249

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings (loss) per share — basic average shares outstanding
82,261

 
77,107

 
83,714

 
77,127

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based payments
2,028

 
—

 
1,931

 
231

Convertible senior notes
—

 
—

 
8,402

 
—

Denominator for diluted earnings (loss) per share — diluted average shares outstanding
84,289

 
77,107

 
94,047

 
77,358

Basic earnings (loss) per share
$
.14

 
$
(.86
)
 
$
.32

 
$
.04

Diluted earnings (loss) per share
$
.14

 
$
(.86
)
 
$
.30

 
$
.04