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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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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- Definition

The cash outflow to reacquire common stock during the period.

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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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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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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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- Definition

Amount of cash inflow (outflow) from financing activities classified as other.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands			9 Months Ended
	Sep. 28, 2020	Aug. 25, 2019	Sep. 30, 2020	Sep. 30, 2019
Condensed Financial Statements, Captions [Line Items]
Proceeds from Issuance of Common Stock				$ 83
Cash flows from operations:
Cash provided by/(used in) operating activities			$ (148,383)	22,897
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements			(3,708)	(8,672)
Cash used in investing activities			(3,708)	(6,952)
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock			(4,597)	(4,408)
Proceeds from Issuance or Sale of Equity			34	83
Payments for Repurchase of Common Stock			(14,228)	(8,400)
Payments for employee taxes withheld related to vested share-based awards			(5,771)	(1,014)
Proceeds from Issuance of Secured Debt			125,000	0
Repurchase of Secured Debt			(1,426)	0
Payments of Debt Issuance Costs			(210)	0
Payment for Debt Extinguishment or Debt Prepayment Cost	$ (2,500)	$ (1,700)	(2,507)	(1,688)
Repayments of Secured Debt		$ 50,000	148,574	50,000
Redemption of senior secured notes			156,900	(15,000)
Cash provided by (used in) financing activities			104,621	(80,427)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			(47,470)	(64,482)
Cash and cash equivalents, beginning of period			79,550	90,675
Cash and cash equivalents, end of period			32,080	26,193
Eliminations
Condensed Financial Statements, Captions [Line Items]
Proceeds from Issuance of Common Stock				0
Cash flows from operations:
Cash provided by/(used in) operating activities			0	0
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements			0	0
Cash used in investing activities			0	0
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock			0	0
Payments for Repurchase of Common Stock			0
Payments for employee taxes withheld related to vested share-based awards			0	0
Redemption of senior secured notes			0	0
Cash provided by (used in) financing activities			0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period			0	0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Proceeds from Issuance of Common Stock				83
Cash flows from operations:
Cash provided by/(used in) operating activities			51,332	16,687
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements			0	0
Cash used in investing activities			0	0
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock			(4,597)	(4,408)
Proceeds from Issuance or Sale of Equity			34
Payments for Repurchase of Common Stock			(14,228)
Payments for employee taxes withheld related to vested share-based awards			(5,771)	(1,014)
Proceeds from Issuance of Secured Debt			125,000
Repurchase of Secured Debt			(1,426)
Payments of Debt Issuance Costs			(210)
Payment for Debt Extinguishment or Debt Prepayment Cost			(2,507)	(1,688)
Repayments of Secured Debt			148,574	50,000
Redemption of senior secured notes			0	0
Cash provided by (used in) financing activities			(52,279)	(65,427)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			(947)	(48,740)
Cash and cash equivalents, beginning of period			4,811	53,525
Cash and cash equivalents, end of period			3,864	4,785
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Proceeds from Issuance of Common Stock				0
Cash flows from operations:
Cash provided by/(used in) operating activities			(1,991)	(3,292)
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements			0	0
Cash used in investing activities			0	0
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock			0	0
Payments for Repurchase of Common Stock			0
Payments for employee taxes withheld related to vested share-based awards			0	0
Redemption of senior secured notes			0	0
Cash provided by (used in) financing activities			0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			(1,991)	(3,292)
Cash and cash equivalents, beginning of period			2,179	3,826
Cash and cash equivalents, end of period			188	534
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Proceeds from Issuance of Common Stock				0
Cash flows from operations:
Cash provided by/(used in) operating activities			(197,724)	9,502
Cash flows from investing activities
Purchase of furniture, equipment and leasehold improvements			(3,708)	(8,672)
Cash used in investing activities			(3,708)	(6,952)
Cash flows from financing activities
Cash dividends paid on Class A non-voting and Class B voting common stock			0	0
Payments for Repurchase of Common Stock			0
Payments for employee taxes withheld related to vested share-based awards			0	0
Redemption of senior secured notes			156,900	(15,000)
Cash provided by (used in) financing activities			156,900	(15,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			(44,532)	(12,450)
Cash and cash equivalents, beginning of period			72,560	33,324
Cash and cash equivalents, end of period			$ 28,028	$ 20,874