CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Allowance for receivables	$ 1,077	$ 1,323
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000	100,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0
Class A Common Stock [Member]
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000	100,000
Common stock, shares issued (in shares)	32,521	33,179
Common stock, shares outstanding (in shares)	32,521	33,179