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International Risk Factors (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) item	Jun. 30, 2017 USD ($)	Jun. 30, 2010 item
International Risk Factors
Foreign currency gains (losses) | $	$ (1.1)	$ (1.3)	$ (2.5)	$ (3.3)
Venezuela
International Risk Factors
Number of rigs expropriated by Venezuelan government					11
Operating revenues | Geographic concentration risk | South America
International Risk Factors
Concentration percentage			96.00%
Minimum
International Risk Factors
Number of geographical areas of operation to minimize risks			1
Contract Drilling: | Operating revenues | Geographic concentration risk | International locations
International Risk Factors
Concentration percentage			10.00%

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- Definition

Represents the number of geographical areas operated to minimize the potential impact of risks.

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The number of rigs which were expropriated by the Government.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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