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Stockholders' Equity (Tables)
 12 Months Ended
Aug. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Recognized Stock-based Compensation Expense
The Company recognized stock-based compensation expense within selling, general and administrative expense as follows (in thousands):
 
Fiscal Year Ended August 31,
 
2018
 
2017
 
2016
Restricted stock and stock appreciation rights (“SARS”)
$
84,082

 
$
42,122

 
$
52,459

Employee stock purchase plan
6,891

 
6,334

 
6,538

Other (1)
7,538

 
88

 
—

Total
$
98,511

 
$
48,544

 
$
58,997


 
(1) For the fiscal year ended August 31, 2018, represents a one-time cash-settled stock award that vested on November 30, 2017.
Schedule of Shares Available for Issuance
Following is a reconciliation of the shares available to be issued under the 2011 Plan as of August 31, 2018:
 
Shares Available for Grant
Balance as of August 31, 2017
12,228,936

SARS canceled
35,439

Restricted stock awards forfeited, net of grants(1)
572,783

Balance as of August 31, 2018
12,837,158

 
 

(1) Represents the maximum number of shares that can be issued based on the achievement of certain performance criteria.
Summary of Option Activity
The following table summarizes SARS activity from August 31, 2017 through August 31, 2018:
 
SARS
Outstanding
 
Average
Intrinsic Value
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life (years)
Outstanding as of August 31, 2017
319,241

 
$
3,651

 
$
19.91

 
2.10
SARS canceled
(35,439
)
 

 
$
21.56

 

SARS exercised
(127,001
)
 

 
$
21.31

 

Outstanding and exercisable as of August 31, 2018
156,801

 
$
1,748

 
$
18.41

 
3.10
Restricted Stock Activity
The following table summarizes restricted stock activity from August 31, 2017 through August 31, 2018:
 
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding as of August 31, 2017
11,652,319

 
$
22.00

Changes during the period
 
 
 
Shares granted(1)
2,751,300

 
$
29.40

Shares vested
(2,727,229
)
 
$
22.95

Shares forfeited
(3,324,083
)
 
$
19.20

Outstanding as of August 31, 2018
8,352,307

 
$
24.34

 
(1) 
For those shares granted that are based on the achievement of certain performance criteria, the amount represents the maximum number of shares that can vest. During the fiscal year ended August 31, 2018, the Company awarded approximately 1.4 million time-based restricted stock units, 0.4 million performance-based restricted stock units and 0.4 million market-based restricted stock units based on target performance criteria.
Schedule of Share-based Compensation Information
The following table represents the restricted stock and SARS stock-based compensation information for the periods indicated (in thousands):
 
Fiscal Year Ended August 31,
 
2018
 
2017
 
2016
Intrinsic value of SARS exercised
$
909

 
$
5,053

 
$
506

Fair value of restricted stock vested
$
62,592

 
$
44,010

 
$
34,857

Tax benefit (expense) for stock compensation expense(1)
$
1,122

 
$
560

 
$
991

Unrecognized stock-based compensation expense — restricted stock
$
41,940

 
 
 
 
Remaining weighted-average period for restricted stock expense
1.4 years

 
 
 
 
 
 
(1) 
Classified as income tax expense within the Consolidated Statements of Operations.
Weighted Average Assumptions used in Black-Scholes Option Pricing Model
The fair value of shares issued under the ESPP was estimated on the commencement date of each offering period using the Black-Scholes option pricing model. The following weighted-average assumptions were used in the model for each respective period:
 
Fiscal Year Ended August 31,
 
2018
 
2017
 
2016
Expected dividend yield
0.6
%
 
0.8
%
 
0.7
%
Risk-free interest rate
1.4
%
 
0.5
%
 
0.3
%
Expected volatility (1)
23.0
%
 
33.0
%
 
28.1
%
Expected life
0.5 years

 
0.5 years

 
0.5 years

 
(1) 
The expected volatility was estimated using the historical volatility derived from the Company’s common stock.
Cash Dividends Declared to Common Stockholders
The following table sets forth certain information relating to the Company’s cash dividends declared to common stockholders during fiscal years 2018 and 2017:
 
 
Dividend
Declaration Date
 
Dividend
per Share
 
Total of Cash
Dividends
Declared
 
Date of Record for
Dividend Payment
 
Dividend Cash
Payment Date
 
(in thousands, except for per share data)
Fiscal Year 2018:
October 19, 2017
 
$
0.08

 
$
14,588

 
November 15, 2017
 
December 1, 2017
 
January 25, 2018
 
$
0.08

 
$
14,272

 
February 15, 2018
 
March 1, 2018
 
April 19, 2018
 
$
0.08

 
$
13,991

 
May 15, 2018
 
June 1, 2018
 
July 18, 2018
 
$
0.08

 
$
13,677

 
August 15, 2018
 
September 4, 2018
Fiscal Year 2017:
October 20, 2016
 
$
0.08

 
$
15,248

 
November 15, 2016
 
December 1, 2016
 
January 26, 2017
 
$
0.08

 
$
15,051

 
February 15, 2017
 
March 1, 2017
 
April 20, 2017
 
$
0.08

 
$
14,840

 
May 15, 2017
 
June 1, 2017
 
July 20, 2017
 
$
0.08

 
$
14,698

 
August 15, 2017
 
September 1, 2017