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Consolidated Balance Sheets (Parenthetical) shares in Thousands, $ in Thousands	Dec. 26, 2020 USD ($) shares	Dec. 26, 2020 SFr / shares	Dec. 28, 2019 USD ($) shares	Dec. 28, 2019 SFr / shares
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts | $	$ 11,086		$ 6,754
Common shares, par value (in CHF dollars per share) | SFr / shares		SFr 0.10		SFr 0.10
Common shares, authorized	198,077		198,077
Common shares, issued	198,077		198,077
Common shares, outstanding	191,571		190,686

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Amount of allowance for credit loss on accounts receivable, classified as current.

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