Restatement of Previously issued Financial Statements (Details Textual) (USD $) In Thousands, unless otherwise specified	2 Months Ended	3 Months Ended
	Feb. 28, 2013 customer Distributor	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012 Other Restatement Adjustments [Member]	Jun. 30, 2011 Other Restatement Adjustments [Member]
Number of distributors, arrangements with extended payment terms	3
Number of distributors, arrangements with return rights and profit margin protection	1
Number of non-distributor customer, arrangements with honor transfer of title at a date later than the customer's purchase orders indicated	1
Reclassification to contra-revenue		$ 47,748	$ 35,804		$ (2,600)
Selling, general and administrative		11,502	9,788		(2,600)
Decrease in income tax provision		$ (924)	$ (714)	$ 54