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Revenue - Contract Estimates (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Revenue |  |
Accrued sales incentives | $ 1.9 | $ 1.5
Other accrued deductions | $ 2.7 | $ 2.7

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of accrued other revenue deductions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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Namespace Prefix: | wch_
Data Type: | xbrli:monetaryItemType
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X
- Definition 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). + References No definition available. + Details
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Namespace Prefix: | wch_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant