Management representation Subsequent Event (Details) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Subsequent Event [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)	7.5
Authorization to repurchase common shares, percentage of shares of common stock outstanding at the end of the prior fiscal year	5.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	15