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Shareholders' Equity (Deficit): Dividends and Repurchase of Common Stock (Details) - USD ($)			1 Months Ended	12 Months Ended
	Jan. 16, 2020	Mar. 28, 2019	Feb. 28, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Repurchase of Common Stock
Aggregate purchase price of shares repurchased				$ 48,987,500	$ 24,028,100	$ 1,846,400
Dividends
Cash dividends declared and paid (in dollars per share)				$ 0.80	$ 0.90	$ 0.56
Aggregate quarterly cash dividends declared and paid, excluding special dividend				$ 3,000,000.0
Special cash dividend approved by Board of Directors (in dollars per share)				$ 3.00
Total special dividend in cash				$ 11,300,000
Aggregate quarterly cash dividends declared and paid				$ 14,230,800	$ 3,449,100	$ 2,169,900
2020 Tender Offer
Repurchase of Common Stock
Shares authorized for repurchase per tender offer				300,000
Price per share of common stock per tender offer				$ 163.00
Number of shares repurchased	300,000
Purchase price of shares per tender offer	$ 49,000,000.0
2019 Tender Offer
Repurchase of Common Stock
Shares authorized for repurchase per tender offer			150,000
Price per share of common stock per tender offer			$ 159.63
Number of shares repurchased		150,000
Purchase price of shares per tender offer		$ 24,000,000.0
Common Stock Repurchase Program
Repurchase of Common Stock
Purchase of stock, price per share						$ 149.10
Number of shares repurchased						12,384
Aggregate purchase price of shares repurchased						$ 1,800,000
Number of additional shares that can be repurchased				130,604

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