Pending Acquisition - Additional Information (Detail) - Cemex Construction Materials Atlantic, LLC [Member] - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Sep. 11, 2016 |
|
| Business Acquisition [Line Items] | ||
| Asset purchase agreement date | Sep. 11, 2016 | |
| Purchase price to be paid for business acquisition | $ 400.0 |