Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - (Details)

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Commitments and Contingencies - (Details)
$ in Millions
1 Months Ended
Nov. 30, 2016
USD ($)
Apr. 01, 2016
plaintiff
Nov. 30, 2016
defendant
plaintiff
Apr. 30, 2011
Employee
Apr. 30, 2011
subcontractor
Contingencies [Abstract]          
Number of deaths of subcontractor employees       5 5
Aviation Litigation          
Contingencies [Abstract]          
Number of plaintiffs     5    
Number of defendants | defendant     6    
Number of plaintiff deaths   3      
Number of plaintiffs injured   6      
Loss contingency, damages sought | $ $ 1.0