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Employee Benefit Plans (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2018 $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) grant_recipient $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Document Period End Date |  |  | Jun. 30, 2019
Performance Shares [Member] | November Two Thousand Eighteen Grant [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
RSUs granted in the period | shares | 360,000 |  |
Award vesting period | 3 years |  |
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares | $ 37.75 |  |
Compensation expense |  | $ 1.5 | $ 4.6
Performance Shares [Member] | November Two Thousand Eighteen Grant [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of total units granted that vest in the period | 10.00% |  |
Performance Shares [Member] | November Two Thousand Eighteen Grant [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of total units granted that vest in the period | 200.00% |  |
Restricted Stock Units (RSUs) [Member] | November Two Thousand Eighteen Grant [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
RSUs granted in the period | shares |  |  | 1,800,000
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares |  |  | $ 33.75
Compensation expense |  | $ 3.0 | $ 10.4
RSU Grant Recipients | grant_recipient |  |  | 900
Restricted Stock Units (RSUs) [Member] | November Two Thousand Eighteen Grant [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  |  | 3 years
Restricted Stock Units (RSUs) [Member] | November Two Thousand Eighteen Grant [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  |  | 5 years
Retirement Eligible [Member] | Restricted Stock Units (RSUs) [Member] | November Two Thousand Eighteen Grant [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense |  |  | $ 3.5

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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