Guarantees - Narrative (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
---|---|---|
Jun. 30, 2018 |
Dec. 30, 2017 |
|
Guarantor Obligations [Line Items] | ||
Outstanding standby letters of credit | $ 3.8 | $ 4.2 |
Debt instrument, collateral amount | 5.0 | 5.2 |
Banker's guarantees or performance bonds | ||
Guarantor Obligations [Line Items] | ||
Line of credit facility, remaining borrowing capacity | 1.6 | 1.6 |
Proceeds from lines of credit | 0.0 | 0.0 |
Letter of credit | ||
Guarantor Obligations [Line Items] | ||
Customer performance guarantee | 1.9 | 2.2 |
Value added tax license | 1.2 | 1.3 |
Property leases | $ 0.7 | $ 0.7 |