6. Inventories

Inventories consist of the following (in thousands):

	March 31, 2018			September 30, 2017
Finished goods	$	28,533		$	33,690
Work in process		5,070			2,512
Raw material		68,975			70,099
Obsolescence reserve		(31,898	)		(29,614	)
		70,680			76,687
Less current portion		(21,834	)		(20,752	)
Non-current portion	$	48,846		$	55,935

During the six months ended March 31, 2018 and 2017, the Company made non-cash inventory transfers of $8.1 million and $1.0 million, respectively, to rental equipment. Raw materials include semi-finished goods and component parts which totaled approximately $43.6 million and $48.2 million at March 31, 2018 and September 30, 2017, respectively.