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Basis of Presentation and Summary of Significant Accounting Policies - Accounting Standards Update (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net cash provided by investing activities | $ (13,783) | $ (12,694) | $ 3,337
Accounting Standards Update 2016-18 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Movements in restricted cash |  | (24,496) | (24,040)
Accounting Standards Update 2016-18 | As initially reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net cash provided by investing activities |  | 11,802 | 27,377
Accounting Standards Update 2016-18 | Change for adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net cash provided by investing activities |  | $ (12,694) | $ 3,337

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- Definition The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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