The Company (Detail) $ in Millions	Sep. 25, 2017 USD ($)	Sep. 23, 2017 USD ($)	Sep. 30, 2017 business
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number businesses owned | business			3
Bolt and VelocityEHS
Noncash or Part Noncash Divestitures [Line Items]
Proceeds from divestiture of business		$ 354
FolioDynamix
Noncash or Part Noncash Divestitures [Line Items]
Proceeds from divestiture of business	$ 195
Potential downward adjustment to proceeds	$ 130