Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions	3 Months Ended
Jun. 30, 2020 USD ($)
Income Taxes
Refund received of remaining amount of refundable Alternative Minimum Tax carryforwards	$ 4.4

Cash proceeds received in period from refundable alternative minimum tax carryforwards due to the Coronavirus Aid, Relief and Economic Security ("CARES") Act.

No definition available.

Name:	wow_AlternativeMinimumTaxCarryforwardAmountRefunded
Namespace Prefix:	wow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration