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SUPPLEMENTAL CASH FLOW INFORMATION - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Cash payments:    
Interest $ 36,834 $ 52,206
Income taxes 1,190 3,061
Operating cash payments on operating leases 5,410  
Operating cash payments on finance leases 1,516  
Non cash financing activities: 6,000  
Right of use assets obtained in exchange for finance leases obligations    
Right of use assets obtained in exchange for operating lease obligations 3,298  
Right of use assets obtained in exchange for finance leases obligations 16,248  
Exchange of LP Units to shares of Class A common stock 277 6,987
Summit Materials, LLC    
Cash payments:    
Interest 36,834 52,206
Income taxes 1,190 $ 3,061
Operating cash payments on operating leases 5,410  
Operating cash payments on finance leases 1,516  
Non cash financing activities: 6,000  
Right of use assets obtained in exchange for finance leases obligations    
Right of use assets obtained in exchange for operating lease obligations 3,298  
Right of use assets obtained in exchange for finance leases obligations $ 16,248