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Business and geographic segments - Holding Percentage of Subsidiaries (Detail)
Sep. 30, 2023
Chemicals  
Segment Reporting Information [Line Items]  
Controlling interest in subsidiary 81.00%
Component products  
Segment Reporting Information [Line Items]  
Controlling interest in subsidiary 87.00%
Real estate management and development | BMI  
Segment Reporting Information [Line Items]  
Controlling interest in subsidiary 63.00%
Real estate management and development | LandWell | Aggregate General And Limited Interests  
Segment Reporting Information [Line Items]  
Controlling interest in subsidiary 77.00%