Revenue - Contract Estimates (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Revenue
Accrued sales incentives	$ 1.7	$ 1.9

Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales incentives. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

No definition available.

Name:	wch_AccruedSalesIncentivesCurrent
Namespace Prefix:	wch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant