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Business Segments - Additional Information (Detail)
12 Months Ended
Mar. 31, 2018
Location
Facility
Terminal
Plant
Sector
Segment
JointVentures
Segment Reporting Information [Line Items]  
Number of sectors | Sector 3
Number of reportable business segments | Segment 5
Cement plant locations | Location 7
Slag grinding facility | Facility 1
Cement distribution terminals | Terminal 19
Gypsum wallboard plants | Plant 5
Readymix concrete batch plants | Plant 17
Aggregates processing plants | Plant 4
Number of frac sand processing facilities | Facility 2
Number of frac sand drying facilities | Facility 4
Number of frac sand trans-load locations | Location 5
Proportionate consolidation of share of Joint Venture's revenues and operating earnings 50.00%
Cement [Member]  
Segment Reporting Information [Line Items]  
Number of Joint Venture | JointVentures 1