Subsequent Event - Additional Information (Detail)	Aug. 31, 2012	Feb. 28, 2011	Nov. 30, 2013 Subsequent Event
Subsequent Event [Line Items]
Number of shares authorized to be repurchased by VMS Board of Directors	8,000,000	12,000,000	6,000,000

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

No definition available.

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant