Business Segments - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2015 Plant Facility Segment Location Terminal
Segment Reporting Information [Line Items]
Number of operating business segments	5
Cement plant locations	6
Cement distribution terminals	16
Gypsum wallboard plants	5
Readymix concrete batch plant	17
Aggregates processing plant	4
Number of frac sand processing facilities	2
Number of frac sand drying facilities	3
Number of frac sand trans-load locations	4
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	1