Goodwill and Intangible Assets Intangible Assets (Details)	Oct. 31, 2016 Rate
Heavy Civil Marine Construction Segment
Finite-Lived Intangible Assets [Line Items]
Discount rate	25.00%
Percentage off fair value in excess of carry amt	33.30%
Commercial Concrete Segment
Finite-Lived Intangible Assets [Line Items]
Discount rate	20.00%
Percentage off fair value in excess of carry amt	4.20%