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International Risk Factors (Details) $ in Millions	3 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Jun. 30, 2010 item
Number of rigs expropriated by Venezuelan government			11
Foreign currency losses | $	$ 8.5	$ (1.5)
Operating revenues | Geographic concentration risk | South America
Concentration percentage	83.80%
Minimum
Number of geographical areas of operation to minimize risks	1
Contract Drilling: | Operating revenues | Geographic concentration risk | International locations
Concentration percentage	14.80%

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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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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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