Stockholders' Equity - Additional Information (Detail)	Aug. 31, 2011
Stockholders Equity Note [Line Items]
Repurchase of outstanding shares of common stock	3.00%
Repurchase of outstanding shares of common stock under Stock Repurchase Program	730,000

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