v3.26.1
Business Segments - Segment Breakdown of Goodwill (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Goodwill $ 470,673 $ 469,894
Cement [Member]    
Segment Reporting Information [Line Items]    
Goodwill 227,639 227,639
Concrete and Aggregates [Member]    
Segment Reporting Information [Line Items]    
Goodwill 118,878 118,099
Gypsum Wallboard [Member]    
Segment Reporting Information [Line Items]    
Goodwill 116,618 116,618
Recycled Paperboard [Member]    
Segment Reporting Information [Line Items]    
Goodwill $ 7,538 $ 7,538