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Stock-based Compensation Plans (Tables)
 9 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Share-based Compensation, Activity [Table Text Block]
 
 
Number granted
 
Weighted average grant date fair value per instrument
 
Total grant date fair value
(in millions)
Quarter ended December 31, 2017:
 
 
 
 
 
 
Restricted stock units
 
171,288

 
$
12.41

 
$
2.1

Employee stock purchase plan instruments
 
35,099

 
2.28

 
0.1

Phantom Plan awards
 
160,672

 
12.41

 
2.0

PRSUs: 2018 award
 
57,092

 
12.41

 
0.7

2017 award
 
71,070

 
12.41

 
0.9

2016 award
 
71,072

 
12.41

 
0.9

Quarter ended March 31, 2018:
 
 
 
 
 
 
Restricted stock units
 
63,389

 
11.67

 
0.7

Employee stock purchase plan instruments
 
32,702

 
2.49

 
0.1

Phantom Plan awards
 
2,527

 
10.95

 
—

Quarter ended June 30, 2018:
 
 
 
 
 
 
Employee stock purchase plan instruments
 
37,939

 
2.16

 
0.1

 
 
 
 
 
 
$
7.6