Nominal or face amount used to calculate payments on the derivative liability.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Name:	us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Financial Instruments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - Fair Value, Measurements, Recurring $ in Millions, $ in Millions	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Jun. 29, 2018 CAD ($)
Foreign currency forward contracts
Fair Value Measurements at Reporting Date Using
Derivative assets, notional amount	$ 6.0
Derivative liabilities, notional amount		$ 7.0	$ 0.4
Foreign currency option contracts
Fair Value Measurements at Reporting Date Using
Derivative assets, notional amount	$ 19.0
Derivative liabilities, notional amount		$ 30.0