Stockholders' Equity - Additional Information (Detail) - USD ($)								12 Months Ended
	Aug. 20, 2015	Jul. 23, 2015	Jul. 08, 2015	Apr. 29, 2015	Apr. 07, 2015	Mar. 27, 2015	Jan. 06, 2015	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013	Nov. 25, 2015	Aug. 31, 2014
Shareholders Equity [Line Items]
Common stock repurchased (in shares)								4,824,849	7,750,000	6,000,000
Aggregate cash payments for accelerated share repurchase agreements and for shares repurchased in open market								$ 422,036,000	$ 624,017,000	$ 423,664,000
August 2014 Repurchase Program
Shareholders Equity [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors (in shares)												6,000,000
Common stock repurchase period								August 15, 2014 through December 31, 2015
Number of shares remain available for repurchase (in shares)								1,425,151
January 6, 2015
Shareholders Equity [Line Items]
Common stock repurchased (in shares)						74,975	419,874
Value of VMS common stock received upon settlement							$ (45,000,000.0)
April 7, 2015
Shareholders Equity [Line Items]
Common stock repurchased (in shares)				151,604	592,280
Value of VMS common stock received upon settlement					$ (70,000,000.0)
July 8, 2015
Shareholders Equity [Line Items]
Common stock repurchased (in shares)	102,933		418,167
Value of VMS common stock received upon settlement			$ (45,000,000.0)
July 23, 2015
Shareholders Equity [Line Items]
Common stock repurchased (in shares)	105,091	400,000
Value of VMS common stock received upon settlement		$ (43,900,000.0)
November 2015 | Subsequent Event
Shareholders Equity [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors (in shares)											8,000,000