Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

Share Repurchase Program, Term

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- Definition

Stock Repurchased During Period, Shares, Percent Of Total Shares Expected To Be Repurchased

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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended				1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended	0 Months Ended
	Mar. 27, 2015	Nov. 07, 2014	Feb. 03, 2015	Feb. 04, 2015	Aug. 31, 2012	Mar. 28, 2014	Nov. 30, 2013	Jan. 02, 2015	Apr. 03, 2015	Apr. 03, 2015	Apr. 29, 2015	Aug. 31, 2014
January 6, 2015
Shareholders Equity [Line Items]
Common stock repurchased and retired, shares	74,975	419,874
Payment for accelerated share repurchase		$ 45.0
Percent of shares expected to be repurchased that have been repurchased		80.00%
April 7, 2015
Shareholders Equity [Line Items]
Common stock repurchased and retired, shares			592,280
Payment for accelerated share repurchase			70.0
Percent of shares expected to be repurchased that have been repurchased			80.00%
July 8, 2015
Shareholders Equity [Line Items]
Payment for accelerated share repurchase				$ 45.0
Percent of shares expected to be repurchased that have been repurchased				80.00%
August 2012 Repurchase Program
Shareholders Equity [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors					8,000,000
Common stock repurchase period					September 29, 2012 through December 31, 2013
Common stock repurchased and retired, shares						2,000,000
Number of shares remain available for repurchase									0	0
November 2013 Repurchase Program
Shareholders Equity [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors							6,000,000
Common stock repurchase period							December 30, 2013 through December 31, 2014
Common stock repurchased and retired, shares						2,000,000		250,000
Number of shares remain available for repurchase									0	0
August 2014 Repurchase Program
Shareholders Equity [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors												6,000,000
Common stock repurchased and retired, shares									824,849	2,074,849
Number of shares remain available for repurchase									3,925,151	3,925,151
Subsequent Event \| April 7, 2015
Shareholders Equity [Line Items]
Common stock repurchased and retired, shares											151,604