Restricted cash - Additional Information (Detail) € in Millions, $ in Millions	Mar. 27, 2020 EUR (€)	Mar. 27, 2020 USD ($)	Jun. 28, 2019 EUR (€)	Jun. 28, 2019 USD ($)
Outstanding letter of credit amount \| €	€ 6.0		€ 6.0
Amount of cash collateral \| $		$ 7.4		$ 7.4

Amount of assets pledged to secure a debt instrument.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Name:	us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant