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Unaudited Pro Forma Results (Detail) - CRS Proppants [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Business Acquisition [Line Items] |  |
Revenues | $ 1,124,755 | $ 961,006
Net Income | $ 188,715 | $ 107,764
Earnings per share – basis | $ 3.80 | $ 2.20
Earnings per share - diluted | $ 3.75 | $ 2.16

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