Management of financial risk - Trade receivables and contract assets (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	¥ 998,036	¥ 934,152
Contract assets.	122,628	228,763
Allowance account for credit losses of financial assets	59,852	82,340
Gross carrying amount \| Three-stage approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.		934,152
Contract assets.		311,103
Gross carrying amount of trade receivables and contract assets		1,245,255
Impairment loss allowance \| Three-stage approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.		42,978
Contract assets.		82,340
Allowance account for credit losses of financial assets		125,318
Credit risk \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Gross carrying amount of trade receivables and contract assets	1,180,516	¥ 1,245,255
Credit risk \| Gross carrying amount \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	998,036
Contract assets.	182,480
Gross carrying amount of trade receivables and contract assets	1,180,516
Credit risk \| Impairment loss allowance \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Allowance account for credit losses of financial assets	116,899
Trade receivable. \| Credit risk \| Impairment loss allowance \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	57,047
Contract asset \| Credit risk \| Impairment loss allowance \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Contract assets.	¥ 59,852

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2022-03-24

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- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_105&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 116
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2022-03-24

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount due from customers for goods and services sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 78
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2022-03-24

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- Definition

The carrying amount as of the balance sheet date of trade receivables and contract assets.

+ References

No definition available.

+ Details

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