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Earnings Per Share (Tables)
 9 Months Ended
Aug. 31, 2020
Earnings Per Share, Basic and Diluted [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):
 
 
Three Months Ended August 31,
 
Nine Months Ended August 31,
 
 
2020
 
2019
 
2020
 
2019
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
78,415

 
$
68,136

 
$
190,152

 
$
145,608

Less: Distributed earnings allocated to nonvested restricted stock
 
(42
)
 
(48
)
 
(129
)
 
(76
)
Less: Undistributed earnings allocated to nonvested restricted stock
 
(360
)
 
(365
)
 
(875
)
 
(825
)
Numerator for basic earnings per share
 
78,013

 
67,723

 
189,148

 
144,707

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

 
—

 
—

 
541

Add: Undistributed earnings allocated to nonvested restricted stock
 
360

 
365

 
875

 
825

Less: Undistributed earnings reallocated to nonvested restricted stock
 
(346
)
 
(354
)
 
(843
)
 
(769
)
Numerator for diluted earnings per share
 
$
78,027

 
$
67,734

 
$
189,180

 
$
145,304

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average shares outstanding — basic
 
90,535

 
88,262

 
90,292

 
87,630

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Share-based payments
 
3,570

 
4,580

 
3,496

 
4,501

Convertible senior notes
 
—

 
—

 
—

 
1,901

Weighted average shares outstanding — diluted
 
94,105

 
92,842

 
93,788

 
94,032

Basic earnings per share
 
$
.86

 
$
.77

 
$
2.09

 
$
1.65

Diluted earnings per share
 
$
.83

 
$
.73

 
$
2.02

 
$
1.55