Property, plant, and equipment consists of the following:



	June 30, 2020			September 30, 2019
Machinery and equipment	$	341,606		$	316,390
Rental equipment	201,379			172,534
Land and buildings	69,313			64,165
Construction in process	54,975			40,599
	667,273			593,688
Less: accumulated depreciation	(310,849		)	(260,104		)
	$	356,424		$	333,584

The Company entered into secured financing agreements that require providing a security interest in specified equipment. As of June 30, 2020 and September 30, 2019, the gross and net amounts of those assets are as follows:



	June 30, 2020				September 30, 2019
	Gross		Net		Gross		Net
Machinery and equipment	$	59,307	$	49,959	$	48,288	$	42,162
Construction in process	3,724		3,724		2,531		2,531
	$	63,031	$	53,683	$	50,819	$	44,693

Depreciation expense and maintenance and repairs expense for the three and nine months ended June 30, 2020 and 2019 were as follows:



	Three Months Ended June 30,				Nine Months Ended June 30,
	2020		2019		2020		2019
Depreciation expense	$	18,992	$	15,979	$	54,480	$	47,334
Maintenance and repair expense	4,601		6,144		15,915		18,192