SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 788	$ 871	$ 894
Charged to Costs and Expenses	4,151	4,023	4,467
Deductions	4,176	4,106	4,490
Balance at End of Period	763	788	871
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	864	1,017	1,171
Charged to Costs and Expenses	(250)
Deductions	143	153	154
Balance at End of Period	471	864	1,017
Allowance for deferred tax assets
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	247
Charged to Costs and Expenses	87	247
Balance at End of Period	$ 334	$ 247