Stock-Based Compensation - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	0 Months Ended	1 Months Ended
	Mar. 31, 2014	Feb. 06, 2014 Restricted Stock	Nov. 30, 2013 Restricted Stock	Mar. 31, 2014 Restricted Stock
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Restricted shares issued		3,000	184,000
Fair value of the Company’s common stock on the date of grant		$ 69.96	$ 98.68
Unrecognized compensation expense		$ 0.2	$ 17.3	$ 15.4
Expected period for recognition of unrecognized compensation expense		4 years	4 years
Forfeiture of restricted stock	4,000