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BALANCE SHEET COMPONENTS | 3 Months Ended
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Dec. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
BALANCE SHEET COMPONENTS | BALANCE SHEET COMPONENTS The following tables reflect the components of significant balance sheet accounts as of December 28, 2019 and September 28, 2019:
| As of
(in thousands) | December 28, 2019 |  | September 28, 2019
Short term investments, available-for-sale(1) | $ | 119,000 |  |  | $ | 229,000 |
Inventories, net: |  |  |  |  |
Raw materials and supplies | $ | 51,651 |  |  | $ | 52,853 |
Work in process | 37,481 |  |  | 32,026 |
Finished goods | 36,122 |  |  | 33,742 |
| 125,254 |  |  | 118,621 |
Inventory reserves | (30,045 | ) |  | (29,313 | )
| $ | 95,209 |  |  | $ | 89,308 |
Property, plant and equipment, net: |  |  |  |  |
Land | $ | 2,182 |  |  | $ | 2,182 |
Buildings and building improvements | 22,282 |  |  | 41,961 |
Leasehold improvements | 24,542 |  |  | 24,441 |
Data processing equipment and software | 36,626 |  |  | 36,302 |
Machinery, equipment, furniture and fixtures | 73,018 |  |  | 71,465 |
Construction in progress | 6,769 |  |  | 6,512 |
| 165,419 |  |  | 182,863 |
Accumulated depreciation | (108,593 | ) |  | (110,493 | )
| $ | 56,826 |  |  | $ | 72,370 |
Accrued expenses and other current liabilities: |  |  |  |  |
Accrued customer obligations (2) | $ | 26,484 |  |  | $ | 26,292 |
Wages and benefits | 18,473 |  |  | 18,188 |
Dividend payable | 7,651 |  |  | 7,582 |
Commissions and professional fees | 2,432 |  |  | 2,024 |
Deferred rent | — |  |  | 1,721 |
Severance | 1,205 |  |  | 1,500 |
Other | 6,277 |  |  | 7,226 |
| $ | 62,522 |  |  | $ | 64,533 |
(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 months ended December 28, 2019 and December 29, 2018.
(2) Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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