STOCK-BASED COMPENSATION - Shareholder Return Market Condition and Assumptions (Details) - Performance Units	9 Months Ended
	Sep. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Risk-free rate	4.01%
Expected term (in years)	2 years 10 months 2 days
Expected volatility (TreeHouse Foods, Inc.)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	33.68%
Expected volatility (Peer Group)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	36.45%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

TreeHouse Foods, Inc. 10-Q