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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES, Other Significant Affiliates - Unconsoildated Tables (Details)

v3.20.1
VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES, Other Significant Affiliates - Unconsoildated Tables (Details) - USD ($)
$ in Thousands
5 Months Ended 7 Months Ended 12 Months Ended
Mar. 31, 2020
Oct. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Jul. 24, 2019
Variable Interest Entities and Other Investments in Significant Affiliates [Abstract]          
Equity method investment, ownership percentage         58.22%
Investment in unconsolidated affiliates $ 110,058   $ 118,203    
Earnings, net of losses, from entities accounted for under the equity method 4,294 $ 6,589 1,799 $ 16,181  
Earnings from unconsolidated affiliates, net of losses 7,262 6,589 4,317 18,699  
Proceeds from Equity Method Investment, Distribution 0 200 200 400  
Equity Method Investment, Summarized Financial Information [Abstract]          
Current assets 144,603   152,438    
Non-current assets 254,807   274,401    
Total assets 399,410   426,839    
Current liabilities 97,689   106,658    
Non-current liabilities 141,936   160,082    
Equity 159,785   160,099    
Total liabilities and equity 399,410   426,839    
Revenue 37,303 158,823 254,617 298,731  
Gross profit 8,153 13,034 47,894 46,717  
Net income $ 2,989 5,684 $ (7,115) 13,285  
Petroleum Air Services          
Variable Interest Entities and Other Investments in Significant Affiliates [Abstract]          
Equity method investment, ownership percentage 25.00%   25.00%    
Investment in unconsolidated affiliates $ 33,000   $ 6,286    
Business acquisition, percentage of voting interests acquired 25.00%   20.00%    
Dividends from entities accounted for under the cost method $ 2,968 0 $ 2,518 2,518  
Cougar          
Variable Interest Entities and Other Investments in Significant Affiliates [Abstract]          
Equity method investment, ownership percentage 40.00%   40.00%    
Investment in unconsolidated affiliates $ 54,483   $ 58,047    
Business acquisition, percentage of voting interests acquired 25.00%        
Earnings, net of losses, from entities accounted for under the equity method $ 3,593 6,538 $ 4,100 9,084  
Lider          
Variable Interest Entities and Other Investments in Significant Affiliates [Abstract]          
Equity method investment, ownership percentage 41.90%   41.90%    
Investment in unconsolidated affiliates $ 22,000   $ 50,784    
Business acquisition, percentage of voting interests acquired 20.00%        
Earnings, net of losses, from entities accounted for under the equity method $ 453 (438) (2,059) 7,179  
Other Unconsolidated Significant Affiliates          
Variable Interest Entities and Other Investments in Significant Affiliates [Abstract]          
Investment in unconsolidated affiliates 575   3,086    
Earnings, net of losses, from entities accounted for under the equity method $ 248 $ 489 $ (242) $ (82)