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Business Segments - Additional Information (Detail)
 12 Months Ended
Mar. 31, 2020
Location
Facility
Terminal
Plant
Sector
Segment
Segment Reporting [Abstract]  
Number of sectors | Sector 3
Number of reportable business segments | Segment 5
Cement plant locations | Location 8
Slag grinding facility | Facility 1
Cement distribution terminals | Terminal 29
Gypsum wallboard plants | Plant 5
Readymix concrete batch plants | Plant 26
Aggregates processing plants | Plant 5
Number of frac sand processing facilities | Facility 2
Number of frac sand drying facilities | Facility 4
Number of frac sand trans-load locations | Location 2
Proportionate consolidation of share of joint venture revenues and operating earnings 50.00%