Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Supplemental Stockholders' Equity Information - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Jan. 14, 2015
Class of Stock [Line Items]
Share repurchases		$ 15,056,000
Stock repurchase program, remaining authorized repurchase amount	$ 16,200,000
Class A Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount			$ 101,100,000
Shares repurchased (in shares)	6,690,905
Share repurchases	$ 84,900,000