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Segment Information - Additional Information (Detail)
 6 Months Ended
Sep. 30, 2015
Location
Facility
Terminal
Plant
Segment
JointVentures
Segment Reporting Information [Line Items]  
Number of operating business segments | Segment 5
Cement plant locations | Location 6
Slag grinding facility 1
Cement distribution terminals | Terminal 16
Gypsum wallboard plants | Plant 5
Readymix concrete batch plant | Plant 17
Aggregates processing plant | Plant 3
Number of frac sand processing facilities 3
Number of frac sand drying facilities 3
Number of frac sand trans-load locations | Location 6
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