Quarterly Financial Information (Unaudited) (Details Textual) (Effect of Prior Periods Adjustment [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2010
Effect of Prior Periods Adjustment [Member]
Quarterly Financial Information (Textual) [Abstract]
Adjustments related to prior periods which reduced net earnings	$ 5.0
Increase in operating expenses	2.9
Increase in provision for income taxes	$ 2.1