Business and Credit Concentration (Details) (Customer concentration risk)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended							12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2013 Net sales Customer A	Mar. 31, 2012 Net sales Customer A	Mar. 31, 2013 Net sales Customer A	Mar. 31, 2012 Net sales Customer A	Mar. 31, 2013 Net sales Customer A Wholesale segment	Mar. 31, 2012 Net sales Customer A Wholesale segment	Mar. 31, 2013 Net sales Customer A Wholesale segment	Mar. 31, 2012 Net sales Customer A Wholesale segment	Mar. 31, 2013 Net sales Customer B	Mar. 31, 2012 Net sales Customer B	Mar. 31, 2013 Net sales Customer B	Mar. 31, 2012 Net sales Customer B	Mar. 31, 2013 Net sales Customer B Wholesale segment	Mar. 31, 2012 Net sales Customer B Wholesale segment	Mar. 31, 2013 Net sales Customer B Wholesale segment	Mar. 31, 2012 Net sales Customer B Wholesale segment	Mar. 31, 2013 Net sales Customer C	Mar. 31, 2012 Net sales Customer C	Mar. 31, 2013 Net sales Customer C Wholesale segment	Mar. 31, 2012 Net sales Customer C Wholesale segment	Mar. 31, 2013 Gross accounts receivable Customer A Wholesale segment	Sep. 30, 2012 Gross accounts receivable Customer A Wholesale segment	Mar. 31, 2013 Gross accounts receivable Customer B Wholesale segment	Sep. 30, 2012 Gross accounts receivable Customer B Wholesale segment	Mar. 31, 2013 Gross accounts receivable Customer C Wholesale segment	Sep. 30, 2012 Gross accounts receivable Customer C Wholesale segment
Business and Credit Concentration
Percentage of concentration risk	13.00%	14.00%	14.00%	14.00%	22.00%	24.00%	22.00%	24.00%	6.00%	7.00%	6.00%	5.00%	10.00%	12.00%	10.00%	9.00%	7.00%	6.00%	11.00%	10.00%	16.00%	18.00%	9.00%	11.00%	9.00%	10.00%