Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.8.0.1
Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]    
Outstanding performance and payment bonds $ 9.7 $ 9.7
Estimated costs to complete projects secured by performance and payment bonds $ 5.6 $ 7.1