Accounting Policies - Additional Information (Detail) - USD ($) $ in Billions	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Jul. 01, 2016
Significant Accounting Policies [Line Items]
Current and long-term accounts receivable, net of allowance for doubtful accounts			$ 22.3
Long-term accounts receivable, net of allowance for doubtful accounts	$ 1.6	$ 1.7
Description of payment terms in contract with customer	Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 to 60 days.