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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Concentration of Risk (Details) - Contract drilling - Operating revenues - Customer concentration	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
International locations
Revenue, Major Customers [Line Items]
Concentration percentage	7.70%	10.10%
South America
Revenue, Major Customers [Line Items]
Concentration percentage	92.10%	95.40%

X

- 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

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- Definition

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+ References

No definition available.

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