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Segment, Customers, and Geographic Information - Major Customer Accounts Receivable as Percentage of Accounts Receivable (Parenthetical) (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 24, 2017
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Maximum [Member] |  |
Revenue, Major Customer [Line Items] |  |
Concentration Risk, Percentage | 10.00% | 10.00%

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