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Debt Costs (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Jul. 31, 2017	Sep. 30, 2016
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized		$ 5,240
Total interest and debt costs		$ 5,240
Predecessor
Debt [Line Items]
Interest and debt costs incurred, net of interest capitalized	$ 574		$ 18,477	$ 11,179	$ 35,431
Interest costs capitalized			1,101		2,494
Total interest and debt costs	$ 574		$ 19,578	$ 11,179	$ 37,925

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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Amount of interest capitalized during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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