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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Revenue, Remaining Performance Obligation, Amount $ 179,341               $ 179,341      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 12 months               12 months      
Contract assets $ 73,467       $ 69,147       $ 73,467 $ 69,147    
Work in progress 14,741       19,461       14,741 19,461    
Sales to external customers 412,468 $ 360,343 $ 348,628 $ 323,002 366,326 $ 342,475 $ 333,690 $ 297,051 1,444,441 1,339,541 $ 1,247,424  
Operating Leases, Income Statement, Lease Revenue                 135,138      
Revenues, Completed Contract Method                 19,815      
Cost of Revenue                 1,018,479 934,808 $ 847,673  
Inventories, net 137,164       $ 134,988       137,164 $ 134,988    
Revenues, Percentage of Completion Method                 326,035      
Accounting Standards Update 2014-09 [Member]                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets                       $ (1,582)
Contract assets                       (6,106)
Work in progress                       6,194
Contract liabilities                       $ 1,773
Sales to external customers                 1,309,303      
Transferred over Time [Member]                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Sales to external customers                 563,386      
Transferred over Time [Member] | Accounting Standards Update 2014-09 [Member]                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Contract assets 644               644      
Sales to external customers                 2,066      
Cost of Revenue                 1,508      
Inventories, net 135               135      
Change from POC to CCM [Member] | Transferred over Time [Member] | Accounting Standards Update 2014-09 [Member]                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Sales to external customers                 $ 1,068      
Minimum [Member] | Transferred at Point in Time [Member]                        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                        
Sales to external customers $ 100