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v2.4.0.6

Subsequent Event (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 15, 2011 | Oct. 31, 2012 | Dec. 05, 2012 Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |
Share repurchase program, maximum amount authorized | $ 150.0 |  | $ 300.0
Share repurchase program, remaining authorized amount |  | $ 78.9 | $ 228.9

X
- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration