Significant Customers - Schedule of Percentage of Net Sales and Net Accounts Receivable Due from Customers from Continuing Operations (Detail)	3 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013
Significant Customers [Line Items]
Percentage of net sales to customers	100.00%	100.00%
Percentage of net accounts receivable due from customers	100.00%		100.00%
BMW [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	18.00%	22.00%
Percentage of net accounts receivable due from customers	13.00%		12.00%
Audi/Volkswagen [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	12.00%	13.00%
Percentage of net accounts receivable due from customers	9.00%		9.00%
Toyota [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	10.00%	10.00%
Percentage of net accounts receivable due from customers	6.00%		6.00%
Chrysler [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	14.00%	8.00%
Percentage of net accounts receivable due from customers	16.00%		12.00%
Other Customers [Member]
Significant Customers [Line Items]
Percentage of net sales to customers	46.00%	47.00%
Percentage of net accounts receivable due from customers	56.00%		61.00%