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v3.19.3.a.u2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Narrative (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) greographical_area | Dec. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 355,010 | $ 228,462 | $ 347,943 | $ 284,355
Restricted cash | 39,300 | 34,100 | 35,000 | $ 41,800
Restricted cash from initial capitalization of captive insurance company | 2,000 |  | 2,000 |
Additional cash restricted at the election of management for potential insurance claims | 33,700 |  | 30,000 |
Restricted cash from other purposes | 100 |  |  |
Underwriting expenses | $ 8,500 |  |  |
Cumulative inflation rate before a country is considered highly inflationary (as a percent) | 100.00% |  |  |
Aggregate foreign currency gain (loss) | $ 1,000 | $ (3,900) |  |
Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Rental contract period | 1 year |  |  |
Insurance coverage deductibles range for claims which occur outside or inside the United States | $ 1,000 |  |  |
Number of geographical areas operating in (more than) | greographical_area | 1 |  |  |
Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Rental contract period | 15 years |  |  |
Insurance coverage deductibles range for claims which occur outside or inside the United States | $ 10,000 |  |  |
Intercompany Eliminations |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Premium revenues and expenses | 7,700 |  |  |
United States |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | 315,800 |  |  |
International Locations |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 39,200 |  |  |
International Locations | Operating Revenue | Geographic Concentration Risk |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration percentage | 7.80% | 8.90% |  |
Argentina |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash | $ 30,500 |  |  |
International Land | South America | International Locations | Segment Operating Revenue | Geographic Concentration Risk |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration percentage | 87.00% | 89.10% |  |
Acquisition of Drilling Technology Companies |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash | $ 3,500 |  | $ 3,000 |

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