Undrawn Available Credit Facilities Classified by Availability Period of Future Borrowing (Detail) - USD ($) $ in Thousands	Sep. 28, 2018	Jun. 29, 2018
Expiring within one year
Line of Credit Facility [Line Items]
Undrawn available credit facilities	$ 0
Expiring beyond one year
Line of Credit Facility [Line Items]
Undrawn available credit facilities	$ 25,000	$ 25,000

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant