Schedule 1 - Registrant's Condensed Financial Statements - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2018	Jul. 01, 2017		Jul. 02, 2016
Cash flows from operating activities:
Net income		$ 198.7	$ 96.3	[1]	$ 68.3	[1]
Changes in operating assets and liabilities, net
Net cash provided by operating activities		367.0	201.7	[1]	228.5	[1]
Cash flows from investing activities:
Net cash used in investing activities		(209.4)	(332.0)	[1]	(157.6)	[1]
Cash flows from financing activities:
Proceeds from exercise of stock options		12.3	4.0	[1]	1.3	[1]
Net proceeds from initial public offering	[1]				226.4
Cash paid for shares withheld to cover taxes		(28.2)	(3.5)	[1]	(0.9)	[1]
Net cash (used in) provided by financing activities		(160.8)	127.5	[1]	(76.5)	[1]
Net decrease in cash and restricted cash		(3.2)	(2.8)	[1]	(5.6)	[1]
Cash and restricted cash, beginning of period	[1]	21.0	23.8		29.4
Cash and restricted cash, end of period		17.8	21.0	[1]	23.8	[1]
Parent Company [Member]
Cash flows from operating activities:
Net income		198.7	96.3		68.3
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Equity in net income of subsidiary		(201.0)	(99.9)		(71.7)
Changes in operating assets and liabilities, net
Intercompany payables		19.1	5.2		7.9
Income tax receivable		(0.9)	(2.1)		(1.9)
Net cash provided by operating activities		15.9	(0.5)		2.6
Cash flows from investing activities:
Capital contributed to subsidiary					(229.4)
Net cash used in investing activities					(229.4)
Cash flows from financing activities:
Proceeds from exercise of stock options		12.3	4.0		1.3
Net proceeds from initial public offering					226.4
Cash paid for shares withheld to cover taxes		(28.2)	(3.5)		(0.9)
Net cash (used in) provided by financing activities		(15.9)	0.5		226.8
Net decrease in cash and restricted cash	[2]		0.0		0.0
Cash and restricted cash, beginning of period	[2]	$ 0.0	0.0		0.0
Cash and restricted cash, end of period	[2]		$ 0.0		$ 0.0

[1] The consolidated statements of cash flows for the fiscal years ended July 1, 2017 and July 2, 2016 have been adjusted to reflect the adoption of ASU 2016-08, Statement of Cash Flows (Topic 230): Restricted Cash. The consolidated statements of cash flows explain the change during the periods in the total of cash and restricted cash. Therefore, restricted cash activity is included with cash when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. Cash payments of $7.3 million in fiscal 2016 related to insurance claims paid using restricted cash is classified as a change in Accrued expenses and other liabilities within Net cash provided by operating activities. Refer to Note 3 for further discussion.

[2] The condensed statements of cash flows for the fiscal years ended July 1, 2017 and July 2, 2016 have been adjusted to reflect the adoption of ASU 2016-08, Statement of Cash Flows (Topic 230): Restricted Cash. Refer to Note 3 for further discussion.