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Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Apr. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenue recognized in accordance with ASC 606 | $ 526,929 | $ 696,901 |  | $ 1,014,396 | $ 1,153,814 |
Revenue on leases | 3,600 |  |  | $ 7,900 |  |
Standard warranty period |  |  |  | 12 months |  |
Deferred revenue and customer advances balance | 24,700 |  |  | $ 46,500 |  |
ASU 2014-09 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Revenue recognized in accordance with ASC 606 | $ 523,300 |  |  | $ 1,006,500 |  |
ASU 2017-07 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Decrease in income from operations |  |  | $ (2,100) |  | $ (1,700) |
Retained Earnings | ASU 2014-09 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount |  |  |  |  |  | $ 12,700
Retained Earnings | ASU 2016-01 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount |  |  |  |  |  | 3,100
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount |  |  |  |  |  | $ (3,100)

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