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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Jun. 30, 2020
Accounting Policies [Abstract] |
Property, Plant and Equipment | The following table sets forth the estimated useful life for various asset categories:
Asset Category | Range of Useful Lives
Buildings | 30 to 50 years
Leasehold improvements | Shorter of 15 years or lease term
Machinery and equipment | 2 to 10 years
Office furniture and fixtures | 7 years
Schedules of Concentration of Risk | The following customers each accounted for more than 10% of total revenues primarily in Semiconductor Process Control segment for the indicated periods:
Year ended June 30, |  |  |  |
2020 |  | 2019 |  | 2018
Taiwan Semiconductor Manufacturing Company Limited |  | Taiwan Semiconductor Manufacturing Company Limited |  | Samsung Electronics Co., Ltd.
Samsung Electronics Co., Ltd. |  |  |  |
The following customers each accounted for more than 10% of net accounts receivable as of the dates indicated below:
As of June 30, |  |
2020 |  | 2019
Taiwan Semiconductor Manufacturing Company Limited |  | Taiwan Semiconductor Manufacturing Company Limited
Samsung Electronics Co., Ltd. |  |

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