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Long-Term Debt - Narrative - Capital Lease Obligations (Details)
ft² in Thousands, $ in Millions
1 Months Ended
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Oct. 31, 2017
ft²
Sep. 30, 2017
ft²
Office Building        
Debt Instrument [Line Items]        
Area of real estate property | ft²       122
Manufacturing Facility        
Debt Instrument [Line Items]        
Area of real estate property | ft²     136  
Forecast | Office Building        
Debt Instrument [Line Items]        
Term of capital lease contract   20 years    
Total financial commitment obligations   $ 47.8    
Fiscal 2018   1.1    
Fiscal 2019   2.0    
Fiscal 2020   2.0    
Fiscal 2021   2.0    
Fiscal 2022   2.1    
Present value of minimum capital lease payments   $ 24.9    
Forecast | Manufacturing Facility        
Debt Instrument [Line Items]        
Term of capital lease contract 31 years      
Total financial commitment obligations $ 35.3      
Fiscal 2018 1.1      
Fiscal 2019 1.7      
Fiscal 2020 1.7      
Fiscal 2021 1.7      
Fiscal 2022 1.7      
Present value of minimum capital lease payments $ 21.0