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Earnings Per Share (Tables)
 12 Months Ended
Nov. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts):
 
Years Ended November 30,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income
$
180,595

 
$
105,615

 
$
84,643

Less: Distributed earnings allocated to nonvested restricted stock
(56
)
 
(45
)
 
(33
)
Less: Undistributed earnings allocated to nonvested restricted stock
(1,121
)
 
(508
)
 
(273
)
Numerator for basic earnings per share
179,418

 
105,062

 
84,337

Effect of dilutive securities:
 
 
 
 
 
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes
2,654

 
2,667

 
2,667

Add: Undistributed earnings allocated to nonvested restricted stock
1,121

 
508

 
273

Less: Undistributed earnings reallocated to nonvested restricted stock
(979
)
 
(453
)
 
(244
)
Numerator for diluted earnings per share
$
182,214

 
$
107,784

 
$
87,033

Denominator:
 
 
 
 
 
Weighted average shares outstanding — basic
85,842

 
85,706

 
92,054

Effect of dilutive securities:
 
 
 
 
 
Share-based payments
4,072

 
2,170

 
2,401

Convertible senior notes
8,402

 
8,402

 
8,402

Weighted average shares outstanding — diluted
98,316

 
96,278

 
102,857

Basic earnings per share
$
2.09

 
$
1.23

 
$
.92

Diluted earnings per share
$
1.85

 
$
1.12

 
$
.85