Revenue from Contracts with Customers (Details Textual)	3 Months Ended
	Sep. 30, 2018
Minimum
Revenue From Contracts With Customers [Line Items]
Payment generally occurs after shipment date	45 days
Minimum | New Vehicle Production | Long-term Supply Agreements
Revenue From Contracts With Customers [Line Items]
Production period	4 years
Minimum | Service Parts Production | Long-term Supply Agreements
Revenue From Contracts With Customers [Line Items]
Production period	10 years
Maximum
Revenue From Contracts With Customers [Line Items]
Payment generally occurs after shipment date	90 days
Maximum | New Vehicle Production | Long-term Supply Agreements
Revenue From Contracts With Customers [Line Items]
Production period	6 years
Maximum | Service Parts Production | Long-term Supply Agreements
Revenue From Contracts With Customers [Line Items]
Production period	15 years