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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 24, 2017
Jun. 25, 2016
Commitments Contingencies And Litigation [Line Items]      
Period of expiration dates of operating leases for office facilities 2019 to 2024    
Total rent expense, recognized on a straight-line basis $ 12.0 $ 10.6 $ 9.2
Contingent consideration liabilities recorded for business combinations $ 8.7    
Minimum [Member]      
Commitments Contingencies And Litigation [Line Items]      
Duration of renewal options of facilities under operating leases 1 year    
Maximum [Member]      
Commitments Contingencies And Litigation [Line Items]      
Duration of renewal options of facilities under operating leases 5 years