Pensions and other postretirement benefit plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	21 Months Ended
	Mar. 31, 2023	Sep. 30, 2024
Gannett Retirement Plan
Defined Benefit Plan Disclosure
Current funding status	100.00%
Forecast | Gannett Retirement Plan
Defined Benefit Plan Disclosure
Defined benefit plan required funding status		100.00%
Expected future employer contributions, quarterly certification funding requirement		$ 1.0
Expected future employer contributions, quarterly certification funding requirement (maximum)		$ 5.0
Pension benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 0.3
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 1.9