The following tables reflect the components of significant balance sheet accounts as of September 30, 2017 and October 1, 2016:



	As of
(in thousands)	September 30, 2017			October 1, 2016

Short term investments, available-for-sale⁽¹⁾	$	216,000		$	124,000

Inventories, net:
Raw materials and supplies ⁽²⁾	$	44,239		$	26,876
Work in process ⁽²⁾	40,827			24,333
Finished goods ⁽²⁾	61,596			57,166
	146,662			108,375
Inventory reserves	(24,639		)	(21,080		)
	$	122,023		$	87,295

Property, plant and equipment, net:
Land	$	2,182		$	—
Buildings and building improvements	50,910			34,472
Leasehold improvements	9,882			19,963
Data processing equipment and software ⁽²⁾	34,700			32,975
Machinery, equipment, furniture and fixtures	68,143			54,730
	165,817			142,140
Accumulated depreciation⁽²⁾	(98,055		)	(91,798		)
	$	67,762		$	50,342

Accrued expenses and other current liabilities:
Wages and benefits	$	47,411		$	24,248
Accrued customer obligations ⁽³⁾	50,497			13,077
Commissions and professional fees	8,555			10,908
Deferred rent	1,930			2,920
Severance ⁽⁴⁾	3,828			1,296
Other	20,093			11,505
	$	132,314		$	63,954

(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. As of September 30, 2017 and October 1, 2016, fair value approximated the cost basis for short-term investments. The Company did not recognize any realized gains or losses on the sale of investments during the years ended 2017 and 2016.


(2)	Certain balances as at October 1, 2016 relating to Inventories and Property, plant and equipment have been reclassified for comparative purposes. These reclassifications have no impact to the Consolidated Balance Sheets as at October 1, 2016.


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


(4)	Includes the restructuring plan discussed in Note 2, severance payable in connection with the October 2015 retirement of the Company's CEO of $0.2 million (as of Oct 1, 2016: $0.8 million), and other severance payments which are not part of the Company's plan to streamline its global operations and functions.