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Net Sales and Operating Loss of CRS Proppants (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]      
Revenues $ 1,124,755us-gaap_BusinessAcquisitionsProFormaRevenue $ 961,006us-gaap_BusinessAcquisitionsProFormaRevenue  
Operating Loss 302,301us-gaap_OperatingIncomeLoss 224,638us-gaap_OperatingIncomeLoss 134,520us-gaap_OperatingIncomeLoss
CRS Proppants [Member]      
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]      
Revenues 28,035us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= exp_CrsProppantsMember		    
Operating Loss $ 5,002us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= exp_CrsProppantsMember