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Revenue From Contracts With Customers - Schedule of Client Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Client receivables	$ 343,546	$ 335,839
Contract assets (unbilled revenue)	98,801	96,297
Contract liabilities (current and long-term deferred revenue)	108,786
Contract liabilities (customer contract deposits)	$ 23,566	0
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Client receivables		335,839
Contract assets (unbilled revenue)		96,297
Contract liabilities (current and long-term deferred revenue)		125,882
Contract liabilities (customer contract deposits)		$ 0

X

- Definition

Contract With Customer Liability, Customer Deposits

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

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+ References

No definition available.

+ Details

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X

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for billed goods or services.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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X

- Definition

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.

+ References

No definition available.

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