Summary of significant accounting policies - Schedule of Cost Less Accumulated Amortization (Details) - Land Use Rights [Member]	Mar. 31, 2026
Minimum [Member]
Summary of significant accounting policies - Schedule of Cost Less Accumulated Amortization (Details) [Line Items]
Property plant and equipment usefu lLife	20 years
Maximum [Member]
Summary of significant accounting policies - Schedule of Cost Less Accumulated Amortization (Details) [Line Items]
Property plant and equipment usefu lLife	50 years

Useful life of property, plant, and equipment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482190/360-10-35-3

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant