Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Derivative Financial Instruments (Narrative) (Details 4)					3 Months Ended
	Sep. 27, 2019	Sep. 26, 2019	Jun. 28, 2018	Jun. 27, 2018	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Derivative [Line Items]
Liability Derivatives					$ 9,438,000	$ 9,747,000
Visa Class B Restricted Securities
Derivative [Line Items]
Liability Derivatives					0
Visa Conversion Rate Swap Agreement
Derivative [Line Items]
Liability Derivatives					$ 453,000	$ 0	$ 1,000,000.0
Visa Class B Restricted Securities
Derivative [Line Items]
Conversion ratio	1.6228	1.6298	1.6298	1.6483	1.6228