RESERVES - APPROPRIATIONS TO RESERVES (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of reserves within equity [line items]
Actual rate of appropriations from retained earnings to reserves	0.00%	0.00%	10.00%
Appropriation to reserves amount	¥ 0	¥ 0	¥ 0
Statutory surplus reserve [member]
Disclosure of reserves within equity [line items]
Stated rate of appropriations from retained earnings to reserves	10.00%
Appropriation to reserves amount	¥ 0	¥ 0	¥ 78,264
Minimum [member] \| Statutory surplus reserve [member]
Disclosure of reserves within equity [line items]
Stated rate of reserve to registered share capital	25.00%
Maximum [member] \| Statutory surplus reserve [member]
Disclosure of reserves within equity [line items]
Stated rate of reserve to registered share capital	50.00%

The actual rate of appropriations from retained earnings to reserves.

No definition available.

Name:	gsh_ActualRateOfAppropriationsFromRetainedEarningsToReserves
Namespace Prefix:	gsh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The stated rate of appropriations from retained earnings to reserves

+ References

No definition available.

+ Details

Name:	gsh_StatedRateOfAppropriationsFromRetainedEarningsToReserves
Namespace Prefix:	gsh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The stated rate of reserve to registered capital

+ References

No definition available.

+ Details

Name:	gsh_StatedRateOfReserveToRegisteredCapital
Namespace Prefix:	gsh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ Details

Name:	ifrs-full_DisclosureOfReservesWithinEquityLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_StatutoryReserveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: