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Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands	Jun. 30, 2023 USD ($)
Commitments Disclosure [Line Items]
Year 1	$ 281,823
Year 2	215,807
Year 3	153,863
Year 4	113,246
Year 5	110,953
Thereafter	1,093,782
Total	1,969,474
Power purchase
Commitments Disclosure [Line Items]
Year 1	83,606
Year 2	47,603
Year 3	29,461
Year 4	12,397
Year 5	12,643
Thereafter	136,244
Total	321,954
Natural gas supply and service agreements
Commitments Disclosure [Line Items]
Year 1	93,739
Year 2	92,102
Year 3	51,456
Year 4	38,265
Year 5	33,088
Thereafter	171,141
Total	479,791
Service agreements
Commitments Disclosure [Line Items]
Year 1	73,974
Year 2	61,943
Year 3	58,602
Year 4	48,070
Year 5	50,529
Thereafter	285,567
Total	578,685
Capital projects
Commitments Disclosure [Line Items]
Year 1	16,537
Year 2	0
Year 3	0
Year 4	0
Year 5	0
Thereafter	0
Total	16,537
Land easements and others
Commitments Disclosure [Line Items]
Year 1	13,967
Year 2	14,159
Year 3	14,344
Year 4	14,514
Year 5	14,693
Thereafter	500,830
Total	$ 572,507

X

- Definition

Commitments Disclosure [Line Items]

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

+ Details

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X

- Definition

Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- Definition

Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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