Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
Jun. 20, 2017 USD ($)
Loss Contingencies [Line Items]
Purchasing commitments contract extended terms	2021
Contractual purchase obligations for goods and services	$ 67.9

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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