Treasury Stock - Narrative (Details) - shares	Sep. 30, 2015	Sep. 30, 2013	Nov. 01, 2008
Stockholders' Equity Note [Abstract]
Number of shares authorized to be repurchased (up to) (in shares)	170,000	105,000	350,000

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