Common Stock (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Common Stock [Abstract]
Stock based compensation cost charged against income, net of tax	$ 2.1	$ 1.6

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

No definition available.

Name:	us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration