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v3.20.4

Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | $ 735,636 | $ 460,317 | $ 423,523
Deferred pension and other post-retirement benefit costs | 1,611 | (442) | 191
Amortization of Deferred benefit costs | (219) | (77) | 86
One time effect of adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |  | (211)
Currency translation adjustment | 25 | 47 | 25
Balance | 956,967 | 735,636 | 460,317
AOCI Attributable to Parent |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance | (1,669) | (1,197) | (1,288)
Currency translation adjustment | 25 | 47 | 25
Balance | $ (252) | $ (1,669) | $ (1,197)

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