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Components of Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Feb. 10, 2017
Business Acquisition [Line Items]      
Intangible Assets $ 10,000    
Goodwill $ 205,211 $ 198,370  
Fairborn Acquisition [Member]      
Business Acquisition [Line Items]      
Inventories     $ 11,106
Property and Equipment     314,897
Intangible Assets     10,000
Other Assets     2,820
Asset Retirement Obligation     (2,820)
Total Net Assets     336,003
Goodwill     64,485
Total Estimated Purchase Price     $ 400,488