Contractual applicable interest rate for funds borrowed, under the debt agreement.

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Represents the fixed charge coverage ratio.

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The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

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Maximum borrowing capacity in foreign currencies under the credit facility.

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Represents the number of quarters included in the interest margin period.

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Ratio of debt to EBITDA.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of the required periodic payments including both interest and principal payments.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Debt - Credit Agreements (Details)	3 Months Ended		9 Months Ended
Debt - Credit Agreements (Details)	Sep. 27, 2020 USD ($)	Sep. 29, 2019	Sep. 27, 2020 USD ($) item $ / shares	Sep. 29, 2019 USD ($)	Dec. 29, 2019 USD ($)
Debt
Outstanding debt	$ 350,000,000		$ 350,000,000		$ 370,000,000
Quarterly dividend paid per common share (in dollars per share) \| $ / shares			$ 0.675
Dividends paid to common shareholders			$ 21,856,000	$ 21,371,000
Debt issuance costs	1,921,000		1,921,000		2,710,000
PJI Facilities
Debt
Outstanding debt	350,000,000.0		$ 350,000,000.0
Number of quarters in interest margin period \| item			4
Line of credit facility, remaining availability	348,800,000		$ 348,800,000
Debt issuance costs	$ 1,900,000		$ 1,900,000
PJI Facilities \| Minimum \| Modification of financial covenants beginning in the third quarter of 2018
Debt
Fixed charge coverage ratio	2.25		2.25
PJI Facilities \| Minimum \| Modification of financial covenants in 2021 and thereafter
Debt
Fixed charge coverage ratio	2.50		2.50
PJI Facilities \| Maximum \| Ability to make dividends and distributions based on Leverage Ratio
Debt
Quarterly dividend paid per common share (in dollars per share) \| $ / shares			$ 0.225
Dividends paid to common shareholders			$ 35,000,000
Leverage Ratio	3.75		3.75
PJI Facilities \| Maximum \| Modification of financial covenants beginning in the third quarter of 2018
Debt
Leverage Ratio	5.00		5.00
PJI Facilities \| Maximum \| Modification of financial covenants by 2022
Debt
Leverage Ratio	4.00		4.00
PJI Facilities \| Maximum \| Option to increase the Revolving Facility or the Term Loan Facility
Debt
Leverage Ratio	4.00		4.00
Additional amount that company has option to increase borrowing capacity			$ 300,000,000.0
PJI Facilities \| LIBOR \| Minimum
Debt
Interest margin rate on debt			1.25%
PJI Facilities \| LIBOR \| Maximum
Debt
Interest margin rate on debt			2.50%
PJI Facilities \| Base rate \| Minimum
Debt
Interest margin rate on debt			0.25%
PJI Facilities \| Base rate \| Maximum
Debt
Interest margin rate on debt			1.50%
PJMF Revolving Facility
Debt
Line of credit facility, maximum borrowing capacity	$ 20,000,000.0		$ 20,000,000.0
Outstanding debt	$ 0		$ 0		$ 0
Applicable interest rate	1.90%	4.00%	2.70%	4.20%
PJMF Revolving Facility \| One-month LIBOR
Debt
Interest margin rate on debt			1.75%
Revolving Facility \| PJI Facilities
Debt
Line of credit facility, maximum borrowing capacity	$ 400,000,000.0		$ 400,000,000.0
Outstanding debt	5,000,000.0		5,000,000.0
Line of credit facility, maximum borrowing capacity of foreign currencies	35,000,000.0		35,000,000.0
Term Loan Facility \| PJI Facilities
Debt
Outstanding debt	$ 345,000,000.0		345,000,000.0
Quarterly amortization payment			$ 5,000,000.0