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Acquisitions - Narrative (Detail)
$ in Thousands, € in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2020
USD ($)
data_center
Oct. 01, 2020
CAD ($)
data_center
Mar. 02, 2020
USD ($)
Jan. 08, 2020
USD ($)
data_center
Apr. 18, 2019
USD ($)
Apr. 18, 2019
EUR (€)
Mar. 31, 2021
CAD ($)
data_center
Dec. 31, 2020
USD ($)
data_center
Dec. 31, 2020
CAD ($)
data_center
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]                            
Stock-based compensation expense                   $ 75,248   $ 63,871 $ 231,658 $ 174,413
Transaction costs for acquisitions                   5,840   $ 2,991 30,987 $ 8,236
Packet Host, Inc.                            
Business Acquisition [Line Items]                            
Consideration transferred     $ 290,300                      
Stock-based compensation expense                     $ 16,100      
Value of equity issued     $ 30,200                      
Vesting period of equity issued     3 years                      
Packet Host, Inc. | Trade names | Measurement input, royalty rate                            
Business Acquisition [Line Items]                            
Measurement input     0.010                      
Packet Host, Inc. | Trade names | Measurement input, discount rate                            
Business Acquisition [Line Items]                            
Measurement input     0.080                      
Packet Host, Inc. | Customer relationships | Measurement input, discount rate                            
Business Acquisition [Line Items]                            
Measurement input     0.080                      
Axtel                            
Business Acquisition [Line Items]                            
Consideration transferred       $ 189,000                    
Data centers purchased | data_center       3                    
Cash consideration for acquisition       $ 175,000                    
Value added taxes       $ 14,000                    
Axtel | Customer relationships | Measurement input, discount rate                            
Business Acquisition [Line Items]                            
Measurement input       0.133                    
Packet and Axtel Acquisitions                            
Business Acquisition [Line Items]                            
Transaction costs for acquisitions                         11,200  
Revenues from acquisitions included in results of operations                   13,400     34,900  
Net loss of acquisitions included in earnings                   $ 7,500     $ 27,800  
Bell Acquisition | Subsequent Event                            
Business Acquisition [Line Items]                            
Data centers purchased | data_center 12 12           1 1          
Cash consideration for acquisition $ 723,900 $ 961.0           $ 60,300 $ 80.0          
Switch Datacenters' AMS1                            
Business Acquisition [Line Items]                            
Cash consideration for acquisition         $ 34,300 € 30.6                
BCE Inc. | Subsequent Event                            
Business Acquisition [Line Items]                            
Data centers purchased | data_center 12 12           1 1          
Forecast | GPX India Acquisition                            
Business Acquisition [Line Items]                            
Data centers purchased | data_center             2              
Cash consideration for acquisition             $ 161.0