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Components of Purchase Price Allocation (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | 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 |  |  | 4,000
Asset Retirement Obligation |  |  | (4,000)
Total Net Assets |  |  | 336,003
Goodwill |  |  | 64,485
Total Estimated Purchase Price |  |  | $ 400,488

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