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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Jun. 30, 2019
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
Schedule of Revenue and Account Receivable by Major Customers by Reporting Segments | 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,
2019 |  | 2018 |  | 2017
Taiwan Semiconductor Manufacturing Company Limited |  | Samsung Electronics Co., Ltd. |  | Samsung Electronics Co., Ltd.
|  |  |  | Taiwan Semiconductor Manufacturing Company Limited
The following customers each accounted for more than 10% of net accounts receivable as of the dates indicated below:
As of June 30,
2019 |  | 2018
Taiwan Semiconductor Manufacturing Company Limited |  | Samsung Electronics Co., Ltd.
|  | Taiwan Semiconductor Manufacturing Company Limited
|  | SK Hynix, Inc.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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