Quarterly report pursuant to Section 13 or 15(d)

Business combinations - Components of Intangible Assets (Details)

v3.21.1
Business combinations - Components of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]    
Cost $ 352,333 $ 245,397
Accumulated Amortization 111,870 99,504
Intangible Assets, net 240,463 145,893
Customer contracts and relationships    
Finite-Lived Intangible Assets [Line Items]    
Cost 341,945 235,287
Accumulated Amortization 102,243 90,302
Intangible Assets, net 239,702 144,985
Technology based intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Cost 5,880 5,631
Accumulated Amortization 5,119 4,723
Intangible Assets, net 761 908
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Cost 4,508 4,479
Accumulated Amortization 4,508 4,479
Intangible Assets, net $ 0 $ 0