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Restructuring - Summary of Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]        
Inventory write-offs $ 7,474      
Property and equipment impairment 2,248      
Other restructuring related costs 9,882      
Contract exit costs 25,350      
Total costs recorded in restructuring and impairment charges 37,480 $ 0    
Total restructuring, impairment and restructuring related costs $ 44,954      
Forecast [Member]        
Restructuring Cost and Reserve [Line Items]        
Inventory write-offs     $ 2,500 $ 9,974
Property and equipment impairment     13,000 15,248
Other restructuring related costs     12,000 21,882
Contract exit costs     55,000 80,350
Total costs recorded in restructuring and impairment charges     80,000 117,480
Total restructuring, impairment and restructuring related costs     $ 82,500 $ 127,454