Pensions and other postretirement benefit plans - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		18 Months Ended	21 Months Ended
	Aug. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2024	Jan. 01, 2022
Defined Benefit Plan Disclosure
Decrease in net unfunded pension obligations				$ 99,900
Decrease benefit obligation due to remeasurement				$ 281,800
Defined benefit plan, discount rate		5.05%		5.05%				2.95%
Defined benefit plan, incremental decrease in plan asset				$ 381,700
Gannett Retirement Plan | Forecast
Defined Benefit Plan Disclosure
Defined benefit plan required funding status							100.00%
Expected future employer contributions, quarterly certification funding requirement							$ 1,000
Expected future employer contributions, quarterly certification funding requirement (maximum)							$ 5,000
Pension Plan
Defined Benefit Plan Disclosure
Pension settlement gain		$ 706	$ 0	706	$ 0
Contribution to the defined benefit plans				17,900
Pension Plan | U.S.
Defined Benefit Plan Disclosure
Deferred contributions by employer in response to COVID-19						$ 5,000
Pension Plan | Gannett Retirement Plan
Defined Benefit Plan Disclosure
Transfer of pension liability	$ 450,000
Pension settlement gain		700
Noncash pension settlement gain, after tax		$ 500
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans				$ 3,800