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Other Matters - Sale of South Pecos Water Disposal Business (Details) - USD ($)
12 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Proceeds from divestitures of businesses and investments, net   $ 335,809,000 $ 329,780,000 $ 134,370,000
Gain (loss) on disposition or impairment of assets, net   $ (34,296,000) $ 17,118,000 $ 208,982,000
Water Solutions South Pecos Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Proceeds from divestitures of businesses and investments, net $ 232,200,000      
Gain (loss) on disposition or impairment of assets, net $ (107,900,000)      
Number of saltwater wells sold 9