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Pensions and other postretirement benefit plans - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	24 Months Ended
	Jun. 30, 2024	Sep. 30, 2024
Gannett Retirement Plan
Defined Benefit Plan Disclosure
Current funding status (as a percent)	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
Defined benefit plan, expected future employee contributions, quarterly certification funding requirement term		60 days
Expected future employer contributions, quarterly certification funding requirement (maximum)		$ 5.0
Pension benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 7.0
Postretirement benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 2.7

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