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Stock-based Compensation Plans (Tables) | 9 Months Ended
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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 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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