Stockholders' Equity and Noncontrolling Interests - Additional Information (Detail) - shares	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015	Nov. 30, 2016
Shareholders Equity [Line Items]
Number (in shares)		3,300,000	5,700,000	4,800,000
Number of shares remain available for repurchase (in shares)		5,200,000
November 2015
Shareholders Equity [Line Items]
Number (in shares)	500,000
November 2016
Shareholders Equity [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors (in shares)					8,000,000.0