Accounts payable and accrued expenses (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Outstanding checks in excess of cash	$ 6,981	$ 9,924
Accounts payable, trade	899,178	824,956
Accrued expenses	409,445	461,035
Product warranties	51,983	49,184
Accrued interest	6,856	21,050
Accrued compensation and benefits	179,642	192,991
Total accounts payable and accrued expenses	$ 1,554,085	$ 1,559,140