Common Stock, Options and Stock Compensation - Additional Disclosures (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended					3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Common Class A [Member]	Mar. 25, 2014 Common Class A [Member]	Sep. 30, 2013 Common Class A [Member]	Mar. 31, 2013 Common Class A [Member]	Mar. 31, 2014 Restricted Stock [Member] Executive Chairman [Member]	Mar. 31, 2014 October 2, 2014 Restricted Stock [Member] Executive Chairman [Member]	Mar. 31, 2014 October 2, 2016 Restricted Stock [Member] Executive Chairman [Member]
Class of Stock [Line Items]
Stock options exercised, shares	3,000	3,000
Common stock, shares authorized			100,000,000	100,000,000	55,550,000	54,000,000
Accelerated vesting of restricted stock							270,000	135,000	135,000
Gross compensation costs							$ 2.2