BALANCE SHEET COMPONENTS

The following tables reflect the components of significant balance sheet accounts as of June 30, 2018 and September 30, 2017:



	As of
(in thousands)	June 30, 2018			September 30, 2017

Short term investments, available-for-sale⁽¹⁾	$	258,000		$	216,000

Inventories, net:
Raw materials and supplies	$	59,817		$	44,239
Work in process	50,561			40,827
Finished goods	38,914			61,596
	149,292			146,662
Inventory reserves	(25,999		)	(24,639		)
	$	123,293		$	122,023
Property, plant and equipment, net:
Land	$	2,182		$	2,182
Buildings and building improvements	52,615			50,910
Leasehold improvements	12,898			9,882
Data processing equipment and software	35,391			34,700
Machinery, equipment, furniture and fixtures	67,087			60,143
Construction in progress	6,893			8,000
	177,066			165,817
Accumulated depreciation	(101,002		)	(98,055		)
	$	76,064		$	67,762
Accrued expenses and other current liabilities:
Wages and benefits	$	40,215		$	47,411
Accrued customer obligations ⁽²⁾	35,108			52,460
Commissions and professional fees	5,938			8,555
Dividends payable	8,176			—
Deferred rent	1,873			1,930
Severance ⁽³⁾	976			3,828
Other	13,907			10,663
	$	106,193		$	124,847


(1)	All short-term investments were classified as available-for-sale and were measured at fair value based on level one measurement, or quoted market prices, as defined by ASC 820. The Company did not recognize any realized gains or losses on the sale of investments during the three and nine months ended June 30, 2018 and July 1, 2017.


(2)	Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.


(3)	Includes the restructuring plan discussed in Note 3, severance payable in connection with the November 2017 departure of the Company's Chief Financial Officer of $0.6 million, and other severance payments.