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Revenue Recognition - Schedule of Amount of Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Revenue Recognition [Line Items] |  |
Deferred revenue and customer advances expected to be recognized | $ 164,965 | $ 166,840
Deferred revenue and customer advances expected to be recognized | 204,257 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-09-30 |  |
Revenue Recognition [Line Items] |  |
Deferred revenue and customer advances expected to be recognized | $ 164,965 |
Deferred revenue and customer advances recognition period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-29 |  |
Revenue Recognition [Line Items] |  |
Deferred revenue and customer advances expected to be recognized | $ 22,856 |
Deferred revenue and customer advances recognition period | 1 year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-27 |  |
Revenue Recognition [Line Items] |  |
Deferred revenue and customer advances expected to be recognized | $ 16,436 |
Deferred revenue and customer advances recognition period |  |

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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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