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Stock-based Compensation (Tables)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Summary of allocation of share-based compensation costs by plan  
A summary of the expense related to stock-based compensation by award type is as follows for the periods presented:
 
 
Fiscal Year Ended September 30,
(In millions)
 
2017
 
2016
 
2015
 
Stock options expense
 
$
274

 
$
534

 
$
697

 
Restricted stock awards expense
 
7,885

 
7,425

 
5,408

 
Before tax stock-based compensation expense
 
8,159

 
7,959

 
6,105

 
Tax benefit
 
(2,917
)
 
(2,832
)
 
—

(a) 
After tax stock-based compensation expense
 
$
5,242

 
$
5,127

 
$
6,105

 

(a) Tax impact is zero due to the existence of a valuation allowance on our deferred tax assets in prior year periods.
Schedule of assumptions for stock option activity
We used the following assumptions for stock options granted, which derived the weighted average fair value shown, for the period presented:
 
 
Fiscal Year Ended September 30,
 
 
2017
 
2016
 
2015
Expected life of options
 
5.4 years

 
4.9 years

 
N/A(a)
Expected volatility
 
50.10
%
 
46.49
%
 
N/A
Expected dividends
 
—

 
—

 
N/A
Weighted average risk-free interest rate
 
1.85
%
 
1.36
%
 
N/A
Weighted average fair value
 
$
5.83

 
$
4.03

 
N/A

(a) N/A - Not applicable, as no stock options were granted during the period.
  
Schedule of stock options and SSARs outstanding
Activity related to stock options for the periods presented is as follows:
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
Outstanding at beginning of period
672,669

 
$
16.49

 
643,907

 
$
18.13

 
650,223

 
$
18.12

Granted
29,410

 
12.50

 
125,449

 
9.19

 
—

 
—

Exercised
(2,313
)
 
10.80

 
—

 
—

 
(1,209
)
 
12.07

Expired
(84,976
)
 
28.45

 
(86,606
)
 
19.70

 
—

 
—

Canceled
(480
)
 
23.65

 
—

 
—

 
—

 
—

Forfeited
(20,557
)
 
11.97

 
(10,081
)
 
10.98

 
(5,107
)
 
19.05

Outstanding at end of period
593,753

 
$
14.76

 
672,669

 
$
16.49

 
643,907

 
$
18.13

Exercisable at end of period
476,606

 
$
15.91

 
503,594

 
$
17.76

 
491,029

 
$
18.40

Vested or expected to vest in the future
585,186

 
$
14.83

 
672,669

 
$
16.49

 
643,877

 
$
18.13

  
Schedule of stock options and SSARS outstanding and exercisable
The following table summarizes information about stock options outstanding and exercisable as of September 30, 2017:
 
Stock Options Outstanding
 
Stock Options Exercisable
Range of Exercise Price
Number Outstanding
 
Weighted Average Contractual Remaining Life (Years)
 
Weighted Average Exercise Price
 
Number Exercisable
 
Weighted Average Contractual Remaining Life (Years)
 
Weighted Average Exercise Price
$1 - $15
379,657

 
4.05
 
$
11.63

 
262,610

 
2.87
 
$
12.33

$16 - $20
157,129

 
3.99
 
19.08

 
157,029

 
3.99
 
19.08

$21- $30
56,967

 
0.12
 
23.65

 
56,967

 
0.12
 
23.65

$1- $30
593,753

 
3.66
 
$
14.76

 
476,606

 
2.91
 
$
15.91

  
Schedule of nonvested stock awards and performance shares
Activity relating to all restricted stock awards for the periods presented is as follows:
 
Year Ended September 30, 2017
 
Performance-Based
 
Time-Based
 
Total
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
Beginning of period
448,693

 
$
16.71

 
807,124

 
$
17.52

 
1,255,817

 
$
17.23

Granted
263,696

 
13.60

 
271,855

 
12.50

 
535,551

 
13.04

Vested
—

 
—

 
(189,029
)
 
15.52

 
(189,029
)
 
15.52

Forfeited
(43,623
)
 
13.11

 
(17,769
)
 
14.08

 
(61,392
)
 
13.39

End of period
668,766

 
$
15.72

 
872,181

 
$
16.47

 
1,540,947

 
$
16.15

 
 
 
 
 
 
 
 
 
 
 
 
 
Year Ended September 30, 2016
 
Performance-Based
 
Time-Based
 
Total
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
Beginning of period
252,022

 
$
16.34

 
704,261

 
$
18.97

 
956,283

 
$
18.27

Granted
231,624

 
15.43

 
259,819

 
14.04

 
491,443

 
14.69

Vested
—

 
—

 
(127,993
)
 
18.58

 
(127,993
)
 
18.58

Forfeited
(34,953
)
 
5.51

 
(28,963
)
 
16.78

 
(63,916
)
 
10.62

End of period
448,693

 
$
16.71

 
807,124

 
$
17.52

 
1,255,817

 
$
17.23

 
 
 
 
 
 
 
 
 
 
 
 
 
Year Ended September 30, 2015
 
Performance-Based
 
Time-Based
 
Total
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
Beginning of period
166,413

 
$
5.78

 
580,154

 
$
18.62

 
746,567

 
$
15.76

Granted
201,157

 
19.03

 
209,035

 
19.00

 
410,192

 
19.01

Vested
—

 
—

 
(64,719
)
 
15.96

 
(64,719
)
 
15.96

Forfeited
(115,548
)
 
5.82

 
(20,209
)
 
18.95

 
(135,757
)
 
7.77

End of period
252,022

 
$
16.34

 
704,261

 
$
18.97

 
956,283

 
$
18.27