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Commitments and Contingencies (Details)
9 Months Ended
Jul. 22, 2016
USD ($)
Jul. 23, 2015
USD ($)
Sep. 30, 2016
USD ($)
Aug. 11, 2016
USD ($)
a
Accounts Payable and Accrued Expenses        
Commitments and Contingencies        
Accrued Litigation Liability     $ 2,900,000  
Telecommunications Capacity        
Commitments and Contingencies        
Open commitments     9,600,000  
Construction Contracts        
Commitments and Contingencies        
Open commitments     49,800,000  
Pending Litigation        
Commitments and Contingencies        
Estimated Loss Contingency, Minimum     600,000  
Estimated Loss Contingency, Maximum     3,100,000  
Pending Litigation | Damages Related To Services Rendered        
Commitments and Contingencies        
Loss Contingency, Damages Sought $ 600,000 $ 802,564    
Pending Litigation | Damages For Loss Of Revenue And Other Costs        
Commitments and Contingencies        
Loss Contingency, Damages Sought   $ 70,080,000    
Commonwealth Of Virginia | Minimum        
Commitments and Contingencies        
Estimated sales and use tax liability     0  
Commonwealth Of Virginia | Maximum        
Commitments and Contingencies        
Potential sales and use tax liability, if certain thresholds are not met     7,500,000  
Estimated sales and use tax liability     $ 4,000,000  
Sunrise Technology Park Reston VA        
Commitments and Contingencies        
Area of Real Estate Property | a       21.75
Purchase price       $ 65,100,000