Significant Customers - Schedule of Percentage of Net Sales and Net Accounts Receivable Due from Customers (Detail) - Customer Concentration Risk [Member]	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | BMW [Member]
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	16.00%	18.00%
Sales Revenue, Net [Member] | Fiat Chrysler Automobiles [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	13.00%	9.00%
Sales Revenue, Net [Member] | The Volkswagen Group [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	12.00%	13.00%
Sales Revenue, Net [Member] | Toyota/Lexus [Member]
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	8.00%	10.00%
Sales Revenue, Net [Member] | Other Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	54.00%	51.00%	50.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Accounts Receivable [Member] | BMW [Member]
Concentration Risk [Line Items]
Concentration risk percentage	9.00%	11.00%
Accounts Receivable [Member] | Fiat Chrysler Automobiles [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	13.00%
Accounts Receivable [Member] | The Volkswagen Group [Member]
Concentration Risk [Line Items]
Concentration risk percentage	7.00%	7.00%
Accounts Receivable [Member] | Toyota/Lexus [Member]
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	4.00%
Accounts Receivable [Member] | Other Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	67.00%	65.00%