Summary of Significant Accounting Policies - Concentrations (Details) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Concentration Risk [Line Items] | ||||
| Percentage of employees covered by collective bargaining agreements | 47.10% | 47.10% | ||
| Customer concentration risk | Consolidated net revenues | ||||
| Concentration Risk [Line Items] | ||||
| Percentage of total net revenues for customer | 20.50% | 19.70% | 19.30% | 19.80% |
| Customer concentration risk | Consolidated net revenues | Sweet Baked Goods | ||||
| Concentration Risk [Line Items] | ||||
| Percentage of total net revenues for customer | 20.00% | 19.00% | 18.70% | 19.10% |
| Customer concentration risk | Consolidated net revenues | In-Store Bakery | ||||
| Concentration Risk [Line Items] | ||||
| Percentage of total net revenues for customer | 0.50% | 0.70% | 0.60% | 0.70% |