Property, Plant and Equipment - Additional Information (Detail) $ in Thousands	3 Months Ended
Dec. 31, 2019 USD ($)	Oct. 03, 2020 USD ($) a
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 9,420,000	$ 9,870,000
Property, plant and equipment, net	6,178,555	6,829,733
Carrying Value of One Field of Wells [Member]
Property, Plant and Equipment [Line Items]
Non-cash impairment charge	35,000
Property, plant and equipment, net	12,300	11,200
Carrying Value of Two Field of Wells [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 66,600	62,400
Unproved Oil and Natural Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		$ 165,000
Ownership percentage of leasehold interest in unproved oil and natural gas properties		49.00%
Unproved oil and gas properties area \| a		54,000

Ownership percentage of leasehold interest in unproved oil and gas properties.

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- Definition

Unproved oil and gas properties area.

+ References

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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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.

+ References

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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