Stock Repurchase Program And Shares Withheld From Vested Restricted Shares - Narrative (Details) (USD $)	0 Months Ended	1 Months Ended
Aug. 21, 2013	Nov. 30, 2014	Dec. 01, 2014	Nov. 30, 2012
Equity [Abstract]
Share repurchase program, authorized amount	$ 100,000,000.0		$ 50,000,000.0	$ 50,000,000
Share repurchase program, additional amount authorized	50,000,000	28,400,000.0
Stock repurchase program, remaining authorized repurchase amount		$ 21,600,000

Amount remaining of a stock repurchase plan authorized.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant