Commitments and Contingencies - Letters of Credit and Bank Guarantees (Details) $ in Thousands	Dec. 30, 2017 USD ($)
Performance Obligations and Customer Deposit Guarantees
Line of Credit Facility [Line Items]
Outstanding letters of credit and bank guarantees	$ 21,021

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.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration