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Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended
	Jun. 30, 2020 Location Facility Terminal Plant Sector Segment	Jun. 30, 2019 USD ($)
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
Readymix concrete batch plants \| Plant	23
Aggregates processing plants \| Plant	4
Gypsum wallboard 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%
Accrued capital expenditures \| $		$ 3.7