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Acquisitions - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 10, 2017
USD ($)
Jan. 31, 2017
USD ($)
Jul. 10, 2015
USD ($)
T
Jan. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]              
Operating Loss         $ 356,570 $ 273,028 $ 302,301
Intangible Assets         10,000    
Goodwill         $ 198,370 133,885  
Fairborn Acquisition [Member]              
Business Acquisition [Line Items]              
Business acquisition, date of acquisition         Feb. 10, 2017    
Business acquisition purchase price $ 400,500            
Depreciation and amortization         $ 1,900    
Operating Loss         (2,394)    
Direct acquisition cost           $ 5,500  
Inventories 11,106            
In-process capital expenditures 314,897            
Intangible Assets 10,000            
Goodwill 64,485            
Other assets $ 4,000            
Fairborn Acquisition [Member] | Fair Value Adjustment to Inventory              
Business Acquisition [Line Items]              
Operating Loss         $ 1,500    
Skyway Plant [Member]              
Business Acquisition [Line Items]              
Business acquisition, date of acquisition         Jul. 10, 2015    
Business acquisition purchase price     $ 29,900        
Ground granulated blast furnace slag purchased | T     600,000        
Business acquisition, refund receivable     $ 2,500        
Business acquisition, refund received   $ 1,000   $ 1,500      
Accounts and notes receivable     1,900        
Inventories     2,300        
In-process capital expenditures     24,600        
Intangible Assets     1,200        
Goodwill     1,400        
Other assets     $ 1,000