Annual report pursuant to Section 13 and 15(d)

Related Parties - Schedule Of Related Party Transactions (Details)

v3.10.0.1
Related Parties - Schedule Of Related Party Transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Disposed entity    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) $ 0.0 $ 0.0
Austin Trucking    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (13.0) (11.8)
Construction Services    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) 1.8 6.3
Deep South Adventures, LLC    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) 0.0 (0.3)
Island Pond    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (0.3) (0.3)
Vehicle Rentals    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (1.2) (1.2)
Consulting Services    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (0.3) (0.2)
Legal Services    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (0.1) (0.3)
H&K    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (0.1) (0.1)
H&A    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (0.1) (0.1)
Subcontracting Services    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (0.2) 0.0
SunTx    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) (1.5) (1.3)
Affiliated Entity | Purchaser of subsidiary    
Related Party Transaction [Line Items]    
Revenue Earned (Expense Incurred) 0.0 0.0
Accounts Receivable (Payable) 0.9 0.0
Affiliated Entity | Disposed entity    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.8 0.0
Affiliated Entity | Austin Trucking    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) (0.8) (1.0)
Affiliated Entity | Construction Services    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 2.9 5.3
Affiliated Entity | Deep South Adventures, LLC    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | Island Pond    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | Vehicle Rentals    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | Consulting Services    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | Legal Services    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | H&K    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | H&A    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) 0.0 0.0
Affiliated Entity | Subcontracting Services    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) (0.1) 0.0
Affiliated Entity | SunTx    
Related Party Transaction [Line Items]    
Accounts Receivable (Payable) $ 0.0 $ 0.0