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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Notes) | 3 Months Ended
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Jan. 02, 2021
Commitments and Contingencies Disclosure [Abstract] |
COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS | COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS Warranty Expense The Company's equipment is generally shipped with a one-year warranty against manufacturing defects. The Company establishes reserves for estimated warranty expense when revenue for the related equipment is recognized. The reserve for estimated warranty expense is based upon historical experience and management's estimate of future warranty costs, including product part replacement, freight charges and labor costs incurred in correcting product failures during the warranty period. The following table reflects the reserve for warranty activity for the three months ended January 2, 2021 and December 28, 2019:
|  |  | Three months ended
(in thousands) |  |  |  |  | January 2, 2021 |  | December 28, 2019
Reserve for warranty, beginning of period |  |  |  |  | $ | 9,576 |  |  | $ | 14,185 |
Provision for warranty |  |  |  |  | 5,300 |  |  | 3,495 |
Utilization of reserve |  |  |  |  | (2,740) |  |  | (2,966) |
Reserve for warranty, end of period |  |  |  |  | $ | 12,136 |  |  | $ | 14,714 |
Other Commitments and Contingencies The following table reflects obligations not reflected on the Consolidated Condensed Balance Sheet as of January 2, 2021:
|  |  | Payments due by fiscal year
(in thousands) | Total |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | thereafter
Inventory purchase obligation (1) | $ | 362,675 |  |  | $ | 362,675 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
(1)The Company orders inventory components in the normal course of its business. A portion of these orders are non-cancellable and some orders impose varying penalties and charges in the event of cancellation. Concentrations The following table reflects significant customer concentrations as a percentage of net revenue for the three months ended January 2, 2021 and December 28, 2019:
| Three months ended
| January 2, 2021 |  | December 28, 2019
ASE Technology Holding | 22.7 | % |  | *
Haoseng Industrial Co., Ltd (1) | 11.3 | % |  | *
(1)Distributor of the Company's products. * Represented less than 10% of total net revenue The following table reflects significant customer concentrations as a percentage of total accounts receivable as of January 2, 2021 and December 28, 2019:
| As of
| January 2, 2021 |  | December 28, 2019
Forehope Electronic Co., Ltd | 17.5 | % |  | 14.0 | %
Haoseng Industrial Co., Ltd (1) | 14.4 | % |  | *
Xinye (HK) Electronics. Co (1) | * |  | 14.1 | %
Super Power International (1) | * |  | 10.4 | %
(1)Distributor of the Company's products. * Represented less than 10% of total accounts receivable

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