Cash, Cash Equivalents and Marketable Securities - Additional Information (Detail)	9 Months Ended
	Mar. 30, 2018 USD ($)
Cash, cash equivalents and marketable securities [Line Items]
(Loss) from sales and maturities of available-for-sale securities	$ (400,000)
Impairment losses	0
Cash, cash equivalents and marketable securities at financial institutions located in the United States	$ 40,000,000
Minimum
Cash, cash equivalents and marketable securities [Line Items]
Maturities period of marketable securities	3 months
Maximum
Cash, cash equivalents and marketable securities [Line Items]
Maturities period of marketable securities	3 years