KLA (KLAC) 10-Q 4 Feb 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Dec. 31, 2020	Jan. 15, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	000-09992
Entity Registrant Name	KLA CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2564110
Entity Address, Address Line One	One Technology Drive,
Entity Address, City or Town	Milpitas,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95035
City Area Code	408
Local Phone Number	875-3000
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	KLAC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		154,074,651
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000319201
Current Fiscal Year End Date	--06-30

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Current assets:
Cash and cash equivalents	$ 1,431,466	$ 1,234,409
Marketable securities	865,064	746,063
Accounts receivable, net	1,219,189	1,107,413
Inventories	1,420,618	1,310,985
Other current assets	286,617	324,675
Total current assets	5,222,954	4,723,545
Land, property and equipment, net	594,185	519,824
Goodwill	2,045,445	2,045,402
Deferred income taxes	258,734	236,797
Purchased intangible assets, net	1,289,843	1,391,413
Other non-current assets	403,483	362,979
Total assets	9,814,644	9,279,960
Current liabilities:
Accounts payable	262,496	264,280
Deferred system revenue	274,642	336,237
Deferred service revenue	239,618	233,493
Short-term debt	20,000	0
Other current liabilities	1,223,356	865,776
Total current liabilities	2,020,112	1,699,786
Non-current liabilities:
Long-term debt	3,441,465	3,469,670
Deferred tax liabilities	646,028	660,885
Deferred service revenue	88,769	96,325
Other non-current liabilities	667,964	672,284
Total liabilities	6,864,338	6,598,950
Commitments and contingencies (Notes 9, 14 and 15)
Stockholders’ equity:
Common stock and capital in excess of par value	2,104,190	2,090,268
Retained earnings	903,696	654,930
Accumulated other comprehensive income (loss)	(72,704)	(79,774)
Total KLA stockholders’ equity	2,935,182	2,665,424
Non-controlling interest in consolidated subsidiaries	15,124	15,586
Total stockholders’ equity	2,950,306	2,681,010
Total liabilities and stockholders’ equity	$ 9,814,644	$ 9,279,960

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 1,650,870	$ 1,509,453	$ 3,189,490	$ 2,922,867
Costs and expenses:
Costs of revenues	669,733	633,618	1,290,295	1,237,859
Research and development	229,064	220,751	448,102	431,331
Selling, general and administrative	181,909	192,253	354,540	380,598
Interest expense	38,880	40,472	78,266	80,822
Other expense (income), net	3,882	(2,568)	7,079	(4,186)
Income before income taxes	527,402	424,927	1,011,208	796,443
Provision for income taxes	70,419	44,622	134,083	69,742
Net income	456,983	380,305	877,125	726,701
Less: Net loss attributable to non-controlling interest	(268)	(250)	(693)	(379)
Net income attributable to KLA	$ 457,251	$ 380,555	$ 877,818	$ 727,080
Net income per share attributable to KLA
Basic (in dollars per share)	$ 2.96	$ 2.42	$ 5.67	$ 4.60
Diluted (in dollars per share)	$ 2.94	$ 2.40	$ 5.62	$ 4.56
Weighted-average number of shares:
Basic (in shares)	154,273	157,290	154,777	157,994
Diluted (in shares)	155,560	158,620	156,057	159,314
Product
Revenues:
Revenues	$ 1,238,023	$ 1,144,550	$ 2,383,518	$ 2,202,525
Service
Revenues:
Revenues	$ 412,847	$ 364,903	$ 805,972	$ 720,342

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 456,983	$ 380,305	$ 877,125	$ 726,701
Currency translation adjustments:
Cumulative currency translation adjustments	8,901	2,844	14,341	406
Income tax (provision) benefit	(787)	(247)	(1,190)	146
Net change related to currency translation adjustments	8,114	2,597	13,151	552
Cash flow hedges:
Net unrealized gains (losses) arising during the period	(1,357)	2,290	(2,275)	1,548
Reclassification adjustments for net (gains) losses included in net income	1,115	125	1,061	1,652
Income tax (provision) benefit	52	(412)	260	(436)
Net change related to cash flow hedges	(190)	2,003	(954)	2,764
Net change related to unrecognized losses and transition obligations in connection with defined benefit plans	(379)	(51)	(3,498)	678
Available-for-sale securities:
Net unrealized gains (losses) arising during the period	(911)	616	(1,862)	1,799
Reclassification adjustments for net (gains) losses included in net income	(111)	82	(212)	86
Income tax (provision) benefit	219	(150)	445	392
Net change related to available-for-sale securities	(803)	548	(1,629)	2,277
Other comprehensive income (loss)	6,742	5,097	7,070	6,271
Less: Comprehensive loss attributable to non-controlling interest	(268)	(250)	(693)	(379)
Total comprehensive income attributable to KLA	$ 463,993	$ 385,652	$ 884,888	$ 733,351

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock and Capital in Excess of Par Value, Shares	Common Stock and Capital in Excess of Par Value, Amount	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Total KLA Stockholder's Equity	Total KLA Stockholder's EquityCumulative Effect, Period of Adoption, Adjustment	Non- Controlling Interest
Balance (in shares) at Jun. 30, 2019			159,475
Balance at Jun. 30, 2019	$ 2,677,693			$ 2,017,312	$ 714,825		$ (73,029)	$ 2,659,108		$ 18,585
Increase (Decrease) in Stockholders' Equity
Net income attributable to KLA	346,525				346,525			346,525
Other comprehensive income	1,174						1,174	1,174
Net loss attributable to non-controlling interest	(129)									(129)
Net issuance under employee stock plans (in shares)			281
Net issuance under employee stock plans	(23,423)			(23,423)				(23,423)
Repurchase of common stock (in shares)			(1,659)
Repurchase of common stock	(228,496)			(20,988)	(207,508)			(228,496)
Cash dividends and dividend equivalents declared	(120,669)				(120,669)			(120,669)
Stock-based compensation expense	26,944			26,944				26,944
Balance (in shares) at Sep. 30, 2019			158,097
Balance at Sep. 30, 2019	2,679,619			1,999,845	733,173		(71,855)	2,661,163		18,456
Balance (in shares) at Jun. 30, 2019			159,475
Balance at Jun. 30, 2019	2,677,693			2,017,312	714,825		(73,029)	2,659,108		18,585
Increase (Decrease) in Stockholders' Equity
Net income attributable to KLA	727,080
Other comprehensive income	6,271
Net loss attributable to non-controlling interest	(379)
Repurchase of common stock (in shares)			(3,349)
Repurchase of common stock	(509,089)
Balance (in shares) at Dec. 31, 2019			156,849
Balance at Dec. 31, 2019	2,687,970			2,017,521	719,001		(66,758)	2,669,764		18,206
Balance (in shares) at Jun. 30, 2019			159,475
Balance at Jun. 30, 2019	2,677,693			2,017,312	714,825		(73,029)	2,659,108		18,585
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Balance (in shares) at Jun. 30, 2020			155,461
Balance at Jun. 30, 2020	2,681,010	$ (5,530)		2,090,268	654,930	$ (5,530)	(79,774)	2,665,424	$ (5,530)	15,586
Balance (in shares) at Sep. 30, 2019			158,097
Balance at Sep. 30, 2019	2,679,619			1,999,845	733,173		(71,855)	2,661,163		18,456
Increase (Decrease) in Stockholders' Equity
Net income attributable to KLA	380,555				380,555			380,555
Other comprehensive income	5,097						5,097	5,097
Net loss attributable to non-controlling interest	(250)									(250)
Net issuance under employee stock plans (in shares)			442
Net issuance under employee stock plans	12,262			12,262				12,262
Repurchase of common stock (in shares)			(1,690)
Repurchase of common stock	(280,593)			(21,375)	(259,218)			(280,593)
Cash dividends and dividend equivalents declared	(135,509)				(135,509)			(135,509)
Stock-based compensation expense	26,789			26,789				26,789
Balance (in shares) at Dec. 31, 2019			156,849
Balance at Dec. 31, 2019	2,687,970			2,017,521	719,001		(66,758)	2,669,764		18,206
Balance (in shares) at Jun. 30, 2020			155,461
Balance at Jun. 30, 2020	2,681,010	(5,530)		2,090,268	654,930	(5,530)	(79,774)	2,665,424	(5,530)	15,586
Increase (Decrease) in Stockholders' Equity
Net income attributable to KLA	420,567				420,567			420,567
Other comprehensive income	328						328	328
Net loss attributable to non-controlling interest	(425)									(425)
Net issuance under employee stock plans (in shares)			172
Net issuance under employee stock plans	(25,145)			(25,145)				(25,145)
Repurchase of common stock (in shares)			(1,027)
Repurchase of common stock	(193,897)			(19,400)	(174,497)			(193,897)
Cash dividends and dividend equivalents declared	(141,555)				(141,555)			(141,555)
Stock-based compensation expense	26,992			26,992				26,992
Balance (in shares) at Sep. 30, 2020			154,606
Balance at Sep. 30, 2020	2,762,345			2,072,715	753,915		(79,446)	2,747,184		15,161
Balance (in shares) at Jun. 30, 2020			155,461
Balance at Jun. 30, 2020	2,681,010	$ (5,530)		2,090,268	654,930	$ (5,530)	(79,774)	2,665,424	$ (5,530)	15,586
Increase (Decrease) in Stockholders' Equity
Net income attributable to KLA	877,818
Other comprehensive income	7,070
Net loss attributable to non-controlling interest	(693)
Repurchase of common stock (in shares)			(1,801)
Repurchase of common stock	(371,389)
Balance (in shares) at Dec. 31, 2020			154,161
Balance at Dec. 31, 2020	2,950,306			2,104,190	903,696		(72,704)	2,935,182		15,124
Balance (in shares) at Sep. 30, 2020			154,606
Balance at Sep. 30, 2020	2,762,345			2,072,715	753,915		(79,446)	2,747,184		15,161
Increase (Decrease) in Stockholders' Equity
Net income attributable to KLA	457,251				457,251			457,251
Other comprehensive income	6,742						6,742	6,742
Net loss attributable to non-controlling interest	(268)									(268)
Net issuance under employee stock plans (in shares)			329
Net issuance under employee stock plans	15,356			15,356				15,356
Repurchase of common stock (in shares)			(774)
Repurchase of common stock	(177,492)			(10,477)	(167,015)			(177,492)
Cash dividends and dividend equivalents declared	(140,455)				(140,455)			(140,455)
Stock-based compensation expense	26,827			26,596				26,596		231
Balance (in shares) at Dec. 31, 2020			154,161
Balance at Dec. 31, 2020	$ 2,950,306			$ 2,104,190	$ 903,696		$ (72,704)	$ 2,935,182		$ 15,124

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	Nov. 05, 2020	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.90	$ 0.90	$ 0.90	$ 0.85	$ 0.75

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 456,983	$ 380,305	$ 877,125	$ 726,701
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			164,323	187,122
Loss (gain) on unrealized foreign exchange and other			(18,570)	4,763
Asset impairment charges			865	2,581
Stock-based compensation expense			53,819	53,733
Changes in assets and liabilities, net of assets acquired and liabilities assumed in business acquisitions:
Accounts receivable			(117,189)	(201,896)
Inventories			(112,206)	(6,568)
Other assets			(51,287)	(5,372)
Accounts payable			(1,783)	54,143
Deferred system revenue			(61,595)	(35,245)
Deferred service revenue			(1,431)	(3,117)
Other liabilities			341,181	107,131
Net cash provided by operating activities			1,073,252	883,976
Cash flows from investing activities:
Proceeds from sale of assets			1,855	0
Business acquisitions, net of cash acquired			0	(78,530)
Capital expenditures			(115,069)	(67,440)
Purchases of available-for-sale securities			(492,048)	(408,482)
Proceeds from sale of available-for-sale securities			110,812	35,736
Proceeds from maturity of available-for-sale securities			259,327	357,450
Purchases of trading securities			(35,371)	(21,873)
Proceeds from sale of trading securities			39,668	27,212
Proceeds from other investments			614	1,086
Net cash used in investing activities			(230,212)	(154,841)
Cash flows from financing activities:
Payment of debt issuance costs			40,343	0
Proceeds from revolving credit facility			0	250,000
Repayment of debt			(50,000)	(275,000)
Common stock repurchases			(365,389)	(513,089)
Payment of dividends to stockholders			(280,748)	(256,332)
Issuance of common stock			26,356	24,613
Tax withholding payments related to vested and released restricted stock units			(36,145)	(35,775)
Payment of contingent consideration payable			0	(60)
Net cash used in financing activities			(665,583)	(805,643)
Effect of exchange rate changes on cash and cash equivalents			19,600	378
Net increase (decrease) in cash and cash equivalents			197,057	(76,130)
Cash and cash equivalents at beginning of period			1,234,409	1,015,994	$ 1,015,994
Cash and cash equivalents at end of period	$ 1,431,466	$ 939,864	1,431,466	939,864	$ 1,234,409
Supplemental cash flow disclosures:
Income taxes paid			113,949	70,746
Interest paid			76,996	79,486
Non-cash activities:
Contingent consideration (receivable) payable - financing activities			(8,748)	5,825
Dividends payable - financing activities			1,203	3,190
Unsettled common stock repurchase - financing activities			6,000	4,000
Accrued purchases of land, property and equipment - investing activities			$ 25,987	$ 13,755

BASIS OF PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Basis of Presentation. For purposes of this report, “KLA,” the “Company,” “we,” “our,” “us,” or similar references mean KLA Corporation, and its majority-owned subsidiaries unless the context requires otherwise. The Condensed Consolidated Financial Statements have been prepared by us pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such rules and regulations. The unaudited interim Condensed Consolidated Financial Statements reflect all adjustments (consisting only of normal, recurring adjustments) necessary for a fair statement of the financial position, results of operations, comprehensive income, stockholders’ equity and cash flows for the periods indicated. These Condensed Consolidated Financial Statements and notes, however, should be read in conjunction with Item 8 “Financial Statements and Supplementary Data” included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020. The Condensed Consolidated Financial Statements include the accounts of KLA and its majority-owned subsidiaries. All significant intercompany balances and transactions have been eliminated. On February 20, 2019 ("Acquisition Date"), we completed the acquisition of Orbotech Ltd. ("Orbotech") hereinafter referred to as the "Orbotech Acquisition". The results of operations for the three and six months ended December 31, 2020 are not necessarily indicative of the results that may be expected for any other interim period or for the full fiscal year ending June 30, 2021. Certain reclassifications have been made to the prior year’s Condensed Consolidated Financial Statements to conform to the current year presentation. The reclassifications did not have material effects on the prior year’s Condensed Consolidated Balance Sheets, Statements of Operations, Comprehensive Income and Cash Flows. Management Estimates. The preparation of the Condensed Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions in applying our accounting policies that affect the reported amounts of assets and liabilities (and related disclosure of contingent assets and liabilities) at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Comparability. Effective July 1, 2020, we adopted Accounting Standard Codification ("ASC") 326, Financial Instruments - Credit Losses. Prior periods were not retrospectively recast and, accordingly, the Consolidated Balance Sheet as of June 30, 2020 and the Condensed Consolidated Statement of Operations for the three and six months ended December 31, 2019 were prepared using accounting standards that were different than those in effect for the three and six months ended December 31, 2020. Significant Accounting Policies. With the exception of the change for the accounting of credit losses as a result of the adoption of ASC 326, Financial Instruments - Credit Losses, there have been no other material changes to our significant accounting policies summarized in Note 1 “Description of Business and Summary of Significant Accounting Policies” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020. Credit Losses Cash Equivalents and Marketable Securities . All highly liquid debt instruments with original or remaining maturities of less than three months at the date of purchase are cash equivalents. Marketable securities are generally classified as available-for-sale for use in current operations, if required, and are reported at fair value, with unrealized gains and non-credit related unrealized losses, net of tax, presented as a separate component of stockholders’ equity under the caption “Accumulated other comprehensive income (loss)” (“AOCI”). All realized gains and losses are recorded in earnings in the period of occurrence. The specific identification method is used to determine the realized gains and losses on investments. We regularly review the available-for-sale debt securities in an unrealized loss position, and evaluate the current expected credit loss by considering available information relevant to the collectibility of the security, such as historical experience, market data, issuer-specific factors including credit ratings, default and loss rates of the underlying collateral and structure and credit enhancements, current economic conditions and reasonable and supportable forecasts. If we do not expect to recover the entire amortized cost of the security, the amount representing credit losses, defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis of the debt security, is recorded as an allowance for credit losses with an offsetting entry to earnings; and the amount that is not credit-related is recognized in other comprehensive income (loss). If we have the intent to sell the security or it is more likely than not that we will be required to sell the security before recovery of its entire amortized cost basis, we first write off any previously recognized allowance for credit losses with an offsetting entry to the security’s amortized cost basis. If the allowance has been fully written off and fair value is less than amortized cost basis, we write down the amortized cost basis of the security to its fair value with an offsetting entry to net income. There were no credit losses on available-for-sale debt securities recognized for the three and six months ended December 31, 2020 and 2019. Allowance for Credit Losses . A majority of our accounts receivable are derived from sales to large multinational semiconductor and electronics manufacturers throughout the world. We maintain an allowance for credit losses for expected uncollectible accounts receivable, which is recorded as an offset to accounts receivable and changes in such are classified as selling, general and administrative expense in the Condensed Consolidated Statements of Income. We assess collectibility by reviewing accounts receivable on a collective basis where similar risk characteristics exist and on an individual basis when we identify specific customers with known disputes or collectibility issues. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. The allowance for credit losses is reviewed on a quarterly basis to assess the adequacy of the allowance. For the three and six months ended December 31, 2020, our assessment considered the impact of COVID-19 and estimates of expected credit and collectability trends. The credit losses recognized were not significant for the three and six months ended December 31, 2020 and 2019. Volatility in market conditions and evolving credit trends are difficult to predict and may cause variability and volatility that may have a material impact on our allowance for credit losses in future periods. Recent Accounting Pronouncements Recently Adopted As explained above, on July 1, 2020 we adopted ASC 326, which was issued by the Financial Accounting Board (“FASB”) in June 2016 as Accounting Standards Update ("ASU") No. 2016-13 Financial Instruments – Credit Losses (ASC 326): Measurement of Credit Losses on Financial Instruments . The ASU replaced previous incurred loss impairment guidance and established a single expected credit losses allowance framework for financial assets carried at amortized cost. It also eliminated the concept of other-than-temporary impairment and requires credit losses related to certain available-for-sale debt securities to be recorded through an allowance for credit losses. We adopted ASC 326 using the modified retrospective method, which requires a cumulative-effect adjustment to the opening balance of retained earnings to be recognized on the date of adoption and, accordingly, recorded a net decrease of $5.5 million to retained earnings as of July 1, 2020. Please see the “Credit Losses” accounting policy in the “Significant Accounting Policies” section above. In August 2018, the FASB issued an accounting standard update which modifies the existing accounting standards for the fair value measurement disclosure. This update eliminates the disclosures of the amount of and reasons for transfers between level 1 and level 2 of the fair value hierarchy, and the policy for the timing of transfers between levels. We adopted this update beginning in the first quarter of our fiscal year ending June 30, 2021 on a retrospective basis and the adoption had no material impact on our Condensed Consolidated Financial Statements. In August 2018, the FASB issued an accounting standard update to amend the disclosure requirements related to defined benefit pension and other post-retirement plans. Some of the changes include adding a disclosure requirement for significant gains and losses related to changes in the benefit obligation for the period and removing the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year. We adopted this update beginning in the first quarter of the fiscal year ending June 30, 2021 on a retrospective basis and the adoption had no material impact on our Condensed Consolidated Financial Statements. In August 2018, the FASB issued an accounting standard update to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The guidance clarifies which costs should be capitalized, including the cost to acquire the license and the related implementation costs. We adopted this update beginning in the first quarter of our fiscal year ending June 30, 2021 on a prospective basis, and the adoption had no material impact on our Condensed Consolidated Financial Statements. Updates Not Yet Effective In December 2019, the FASB issued an accounting standard update to simplify the accounting for income taxes in ASC 740, Income Taxes (“ASC 740”). This amendment removes certain exceptions and improves consistent application of accounting principles for certain areas in ASC 740. The update is effective for us beginning in the first quarter of our fiscal year ending June 30, 2022, and early adoption is permitted. We are currently evaluating the impact of this accounting standard update on our Consolidated Financial Statements.

REVENUE

REVENUE	6 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Contract Balances The following table represents the opening and closing balances of accounts receivable, net, contract assets and contract liabilities as of the indicated dates. As of As of (In thousands, except for percentage) December 31, 2020 June 30, 2020 $ Change % Change Accounts receivable, net $ 1,219,189 $ 1,107,413 $ 111,776 10 % Contract assets $ 94,375 $ 99,876 $ (5,501) (6) % Contract liabilities $ 603,029 $ 666,055 $ (63,026) (9) % Our payment terms and conditions vary by contract type, although the terms generally include a requirement of payment of 70% to 90% of total contract consideration within 30 to 60 days of product shipment, with the remainder payable within 30 days of acceptance. The change in contract assets during the six months ended December 31, 2020 was mainly due to $54.5 million of contract assets reclassified to net accounts receivable as our right to consideration for these contract assets became unconditional, partially offset by $48.7 million of revenue recognized for which the payment is subject to conditions other than passage of time. Contract assets are included in Other current assets on our Condensed Consolidated Balance Sheets. During the six months ended December 31, 2020, we recognized revenue of $439.9 million that was included in contract liabilities as of July 1, 2020. This was partially offset by the value of products and services billed to customers for which control of the products and service has not transferred to the customers. Contract liabilities are included in current and non-current liabilities on our Condensed Consolidated Balance Sheets. Remaining Performance Obligations As of December 31, 2020, we had $2.57 billion of remaining performance obligations, which represents our obligation to deliver products and services, and consists primarily of sales orders where written customer requests have been received. We expect to recognize approximately 5% to 15% of these performance obligations as revenue beyond the next twelve months, subject to risk of delays, pushouts, and cancellation by the customer, usually with limited or no penalties.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Our financial assets and liabilities are measured and recorded at fair value, except for our debt and certain equity investments in privately-held companies. Equity investments without a readily available fair value are accounted for using the measurement alternative. The measurement alternative is calculated as cost minus impairment, if any, plus or minus changes resulting from observable price changes. Our non-financial assets, such as goodwill, intangible assets, and land, property and equipment, are assessed for impairment when an event or circumstance indicates that an other-than-temporary decline in value may have occurred. Fair Value of Financial Instruments. We have evaluated the estimated fair value of financial instruments using available market information and valuations as provided by third-party sources. The use of different market assumptions and/or estimation methodologies could have a significant effect on the estimated fair value amounts. The fair value of our cash equivalents, accounts receivable, accounts payable and other current assets and liabilities approximate their carrying amounts due to the relatively short maturity of these items. Fair Value Hierarchy. The authoritative guidance for fair value measurements establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 Valuations based on quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. Level 2 Valuations based on quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities. Level 3 Valuations based on inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. As of December 31, 2020, the types of instruments valued based on quoted market prices in active markets included money market funds, certain U.S. Treasury securities and U.S. Government agency securities. Such instruments are generally classified within Level 1 of the fair value hierarchy. The types of instruments valued based on other observable inputs included corporate debt securities, sovereign securities, municipal securities, and certain U.S. Treasury securities. The market inputs used to value these instruments generally consist of market yields, reported trades and broker / dealer quotes. Such instruments are generally classified within Level 2 of the fair value hierarchy. The principal market in which we execute our foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants generally are large financial institutions. Our foreign currency contracts’ valuation inputs are based on quoted prices and quoted pricing intervals from public data sources and do not involve management judgment. These contracts are typically classified within Level 2 of the fair value hierarchy. The fair value of deferred payments and contingent consideration payable, the majority of which were recorded in connection with business combinations, were classified as Level 3 and estimated using significant inputs that were not observable in the market. See Note 6 “Business Combinations” of the Notes to the Condensed Consolidated Financial Statements for additional information. Financial assets (excluding cash held in operating accounts and time deposits) and liabilities measured at fair value on a recurring basis, as of the date indicated below, were presented on our Condensed Consolidated Balance Sheets as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Little or No Market Activity Inputs As of December 31, 2020 (In thousands) Total (Level 1) (Level 2) (Level 3) Assets Cash equivalents: Money market funds and other $ 795,712 $ 795,712 $ — $ — U.S. Treasury securities 15,400 — 15,400 — Marketable securities: Corporate debt securities 418,348 — 418,348 — Municipal securities 39,352 — 39,352 — Sovereign securities 3,059 — 3,059 — U.S. Government agency securities 146,096 146,096 — — U.S. Treasury securities 175,589 154,599 20,990 — Total cash equivalents and marketable securities (1) 1,593,556 1,096,407 497,149 — Other current assets: Derivative assets 2,660 — 2,660 — Other non-current assets: Executive Deferred Savings Plan 245,673 188,203 57,470 — Total financial assets (1) $ 1,841,889 $ 1,284,610 $ 557,279 $ — Liabilities Derivative liabilities $ (3,841) $ — $ (3,841) $ — Deferred payments (4,400) — — (4,400) Contingent consideration payable (7,214) — — (7,214) Total financial liabilities $ (15,455) $ — $ (3,841) $ (11,614) ________________ (1) Excludes cash of $542.7 million held in operating accounts and time deposits of $160.3 million as of December 31, 2020. Financial assets (excluding cash held in operating accounts and time deposits) and liabilities measured at fair value on a recurring basis, as of the date indicated below, were presented on our Condensed Consolidated Balance Sheets as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Little or No Market Activity Inputs As of June 30, 2020 (In thousands) Total (Level 1) (Level 2) (Level 3) Assets Cash equivalents: Money market funds and other $ 694,950 $ 694,950 $ — $ — Marketable securities: Corporate debt securities 381,957 — 381,957 — Municipal securities 29,110 — 29,110 — Sovereign securities 2,017 — 2,017 — U.S. Government agency securities 106,336 106,336 — — U.S. Treasury securities 181,193 151,210 29,983 — Total cash equivalents and marketable securities (1) 1,395,563 952,496 443,067 — Other current assets: Derivative assets 2,077 — 2,077 — Other non-current assets: Executive Deferred Savings Plan 213,487 166,000 47,487 — Total financial assets (1) $ 1,611,127 $ 1,118,496 $ 492,631 $ — Liabilities Derivative liabilities $ (1,410) $ — $ (1,410) $ — Deferred payments (6,750) — — (6,750) Contingent consideration payable (15,513) — — (15,513) Total financial liabilities $ (23,673) $ — $ (1,410) $ (22,263) ________________ (1) Excludes cash of $460.8 million held in operating accounts and time deposits of $78.7 million as of June 30, 2020. There were no transfers between Level 1, Level 2 and Level 3 fair value measurements during the six months ended December 31, 2020. See Note 8 “Debt” of the Notes to the Condensed Consolidated Financial Statements for disclosure of the fair value of our Senior Notes.

FINANCIAL STATEMENT COMPONENTS

FINANCIAL STATEMENT COMPONENTS	6 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
FINANCIAL STATEMENT COMPONENTS	FINANCIAL STATEMENT COMPONENTS Condensed Consolidated Balance Sheets As of As of (In thousands) December 31, 2020 June 30, 2020 Accounts receivable, net: Accounts receivable, gross $ 1,236,877 $ 1,119,235 Allowance for credit losses (17,688) (11,822) $ 1,219,189 $ 1,107,413 Inventories: Raw materials $ 525,002 $ 478,594 Customer service parts 355,908 338,608 Work-in-process 374,462 334,965 Finished goods 165,246 158,818 $ 1,420,618 $ 1,310,985 Other current assets: Contract assets $ 94,375 $ 99,876 Prepaid expenses 71,330 74,955 Deferred costs of revenue 58,793 77,219 Prepaid income and other taxes 37,744 56,809 Other current assets 24,375 15,816 $ 286,617 $ 324,675 Land, property and equipment, net: Land $ 67,867 $ 67,858 Buildings and leasehold improvements 436,180 405,238 Machinery and equipment 722,084 677,627 Office furniture and fixtures 32,429 29,964 Construction-in-process 126,656 93,736 1,385,216 1,274,423 Less: accumulated depreciation (791,031) (754,599) $ 594,185 $ 519,824 Other non-current assets: Executive Deferred Savings Plan (1) $ 245,673 $ 213,487 Operating lease right of use assets 103,430 100,790 Other non-current assets 54,380 48,702 $ 403,483 $ 362,979 Other current liabilities: Compensation and benefits $ 385,007 $ 251,379 Executive Deferred Savings Plan 245,976 215,167 Customer credits and advances 251,970 114,896 Other accrued expenses 156,916 183,435 Income taxes payable 116,091 35,640 Interest payable 36,176 36,265 Operating lease liabilities 31,220 28,994 $ 1,223,356 $ 865,776 Other non-current liabilities: Income taxes payable $ 362,164 $ 383,447 Pension liabilities 83,618 78,911 Operating lease liabilities 74,443 70,885 Other non-current liabilities 147,739 139,041 $ 667,964 $ 672,284 ________________ (1) We have a non-qualified deferred compensation plan (known as “Executive Deferred Savings Plan” or “EDSP”) under which certain employees and non-employee directors may defer a portion of their compensation. The expense associated with changes in the EDSP liability included in selling, general and administrative expense was $22.1 million and $12.0 million during the three months ended December 31, 2020 and 2019, respectively and was $35.3 million and $13.9 million during the six months ended December 31, 2020 and 2019, respectively. The amount of net gains associated with changes in the EDSP assets included in selling, general and administrative expense was $22.2 million and $11.9 million during the three months ended December 31, 2020 and 2019, respectively and was $35.5 million and $14.2 million during the six months ended December 31, 2020 and 2019, respectively. For additional details, refer to Note 1 “Description of Business and Summary of Significant Accounting Policies” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020. Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive income (loss) (“OCI”) as of the dates indicated below were as follows: (In thousands) Currency Translation Adjustments Unrealized Gains (Losses) on Available-for-Sale Securities Unrealized Gains (Losses) on Cash Flow Hedges Unrealized Gains (Losses) on Defined Benefit Plans Total Balance as of December 31, 2020 $ (30,806) $ 2,054 $ (24,204) $ (19,748) $ (72,704) Balance as of June 30, 2020 $ (43,957) $ 3,683 $ (23,250) $ (16,250) $ (79,774) The effects on net income (loss) of amounts reclassified from accumulated OCI to the Condensed Consolidated Statements of Operations for the indicated period were as follows (in thousands): Three Months Ended Six Months Ended Location in the Condensed Consolidated December 31, December 31, Accumulated OCI Components Statements of Operations 2020 2019 2020 2019 Unrealized gains (losses) on cash flow hedges from foreign exchange and interest rate contracts Revenues $ (711) $ (8) $ (928) $ 365 Costs of revenues and operating expenses (125) (17) 425 (1,818) Interest expense (279) (100) (558) (199) Net gains (losses) reclassified from accumulated OCI $ (1,115) $ (125) $ (1,061) $ (1,652) Unrealized gains (losses) on available-for-sale securities Other expense (income), net $ (111) $ (82) $ (212) $ (86) The amounts reclassified out of accumulated OCI related to our defined benefit pension plans, which were recognized as a component of net periodic cost for the three months ended December 31, 2020 and 2019 were $0.3 million and $0.2 million, respectively, and for the six months ended December 31, 2020 and 2019 were $0.5 million and $0.5 million, respectively. For additional details, refer to Note 13 “Employee Benefit Plans” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020.

MARKETABLE SECURITIES

MARKETABLE SECURITIES	6 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
MARKETABLE SECURITIES	MARKETABLE SECURITIES The amortized cost and fair value of marketable securities as of the dates indicated below were as follows: As of December 31, 2020 (In thousands) Amortized Gross Gross Fair Corporate debt securities $ 416,926 $ 1,445 $ (23) $ 418,348 Money market funds and other 795,712 — — 795,712 Municipal securities 39,190 165 (3) 39,352 Sovereign securities 3,056 3 — 3,059 U.S. Government agency securities 145,774 325 (3) 146,096 U.S. Treasury securities 190,282 708 (1) 190,989 Subtotal 1,590,940 2,646 (30) 1,593,556 Add: Time deposits (1) 160,301 — — 160,301 Less: Cash equivalents 888,792 1 — 888,793 Marketable securities $ 862,449 $ 2,645 $ (30) $ 865,064 As of June 30, 2020 (In thousands) Amortized Gross Gross Fair Corporate debt securities $ 379,334 $ 2,673 $ (50) $ 381,957 Money market funds and other 694,950 — — 694,950 Municipal securities 28,859 251 — 29,110 Sovereign securities 2,009 8 — 2,017 U.S. Government agency securities 106,091 252 (7) 106,336 U.S. Treasury securities 179,631 1,564 (2) 181,193 Subtotal 1,390,874 4,748 (59) 1,395,563 Add: Time deposits (1) 124,153 — — 124,153 Less: Cash equivalents 773,653 — — 773,653 Marketable securities $ 741,374 $ 4,748 $ (59) $ 746,063 ________________ (1) Time deposits excluded from fair value measurements. Our investment portfolio consists of both corporate and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. As yields increase, those securities with a lower yield-at-cost show a mark-to-market unrealized loss. Most of our unrealized losses are due to changes in market interest rates and bond yields. We believe that we have the ability to realize the full value of all of these investments upon maturity. As of December 31, 2020, we had 39 investments in an unrealized loss position. The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below, none of which were in a continuous loss position for 12 months or more: As of December 31, 2020 (In thousands) Fair Value Gross Corporate debt securities $ 47,474 $ (23) Municipal securities 6,478 (3) U.S. Government agency securities 6,504 (3) U.S. Treasury securities 29,252 (1) Total $ 89,708 $ (30) As of June 30, 2020 (In thousands) Fair Value Gross Corporate debt securities $ 44,429 $ (50) Municipal securities 870 — U.S. Government agency securities 9,951 (7) U.S. Treasury securities 19,010 (2) Total $ 74,260 $ (59) The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Condensed Consolidated Balance Sheets, as of the date indicated below were as follows: As of December 31, 2020 (In thousands) Amortized Cost Fair Value Due within one year $ 468,753 $ 470,247 Due after one year through three years 393,696 394,817 $ 862,449 $ 865,064 As of June 30, 2020 (In thousands) Amortized Cost Fair Value Due within one year $ 415,915 $ 418,169 Due after one year through three years 325,459 327,894 $ 741,374 $ 746,063 Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Realized gains and losses on available-for-sale securities for the three and six months ended December 31, 2020 and 2019 were immaterial.

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	6 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS On April 24, 2020, we acquired a product line from a public company for total purchase consideration of $11.4 million, of which $2.2 million was allocated to goodwill. Goodwill recognized was assigned to the Wafer Inspection and Patterning reporting unit, and the amount recognized was deductible for income tax purposes. On August 22, 2019, we acquired the outstanding shares of a privately-held company, primarily to expand our products and services offerings, for a total purchase consideration of $94.0 million inclusive of measurement period adjustments as well as the fair value of the promise to pay an additional consideration up to $60.0 million contingent on the achievement of certain milestones. As of December 31, 2020, the additional consideration was estimated to be zero. The $54.2 million of goodwill was assigned to the Wafer Inspection and Patterning reporting unit, and the amount recognized was not deductible for income tax purposes. As of December 31, 2020, we have $7.2 million of contingent consideration recorded for other acquisitions from fiscal year 2019, which is classified as a non-current liability on the Condensed Consolidated Balance Sheet. For additional details, please refer to Note 6 "Business Combinations" of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020, filed with the SEC on August 7, 2020.

GOODWILL AND PURCHASED INTANGIB

GOODWILL AND PURCHASED INTANGIBLE ASSETS	6 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND PURCHASED INTANGIBLE ASSETS	GOODWILL AND PURCHASED INTANGIBLE ASSETS Goodwill Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in the prior business combinations. We have four reportable segments and six reporting units. For additional details, refer to Note 18 “Segment Reporting and Geographic Information” of the Notes to the Condensed Consolidated Financial Statements. The following table presents changes in goodwill carrying value during the six months ended December 31, 2020 (1) : (In thousands) Wafer Inspection and Patterning Global Service and Support ( “ GSS ” ) Specialty Semiconductor Process PCB and Display Component Inspection Total Balance as of June 30, 2020 $ 416,840 $ 25,908 $ 681,858 $ 907,221 $ 13,575 $ 2,045,402 Foreign currency adjustments 43 — — — — 43 Balance as of December 31, 2020 $ 416,883 $ 25,908 $ 681,858 $ 907,221 $ 13,575 $ 2,045,445 _________________ (1) No goodwill was assigned to the Other reporting unit, and accordingly it was excluded from the table above. Goodwill is not subject to amortization but is tested for impairment annually during the third fiscal quarter as well as whenever events or changes in circumstances indicate that the carrying value may not be recoverable. In testing goodwill for impairment, we utilize a qualitative assessment to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. When performing the qualitative assessment, we consider the following factors: declines in our stock price or market capitalization, declines in our market share, and declines in revenues or profitability at our reporting units. Any impairment charges could have a material adverse effect on our operating results and net asset value in the quarter in which we recognize the impairment charge. If our qualitative assessment indicates that goodwill impairment is more likely than not, we perform a quantitative assessment by comparing the carrying value of net assets to the fair value of the reporting units. If the fair value is determined to be less than the carrying value, the amount of impairment is computed as the excess of the carrying value over the estimated fair value, not to exceed the carrying value of goodwill. As of December 31, 2020, there have been no significant events or circumstances affecting the valuation of goodwill subsequent to the assessment performed in the third quarter of the fiscal year ended June 30, 2020. As a result of that assessment, we recorded $144.2 million and $112.5 million in impairment charges in the Specialty Semiconductor Process and PCB and Display reporting units, respectively, in the three months ended March 31, 2020. For additional details, refer to Note 7 “Goodwill and Purchased Intangible Assets” of the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2020. Purchased Intangible Assets The components of purchased intangible assets as of the dates indicated below were as follows: As of As of (In thousands) December 31, 2020 June 30, 2020 Category Range of Useful Lives (in years) Gross Accumulated Net Gross Accumulated Net Existing technology 4-8 $ 1,373,458 $ 418,402 $ 955,056 $ 1,269,883 $ 342,623 $ 927,260 Customer relationships 4-9 305,817 115,070 190,747 305,817 98,754 207,063 Trade name / Trademark 4-7 117,383 46,355 71,028 117,383 39,216 78,167 Backlog and other <1-9 50,404 49,551 853 50,404 47,215 3,189 Intangible assets subject to amortization 1,847,062 629,378 1,217,684 1,743,487 527,808 1,215,679 In-process research and development 72,259 100 72,159 175,834 100 175,734 Total $ 1,919,321 $ 629,478 $ 1,289,843 $ 1,919,321 $ 527,908 $ 1,391,413 Purchased intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be fully recoverable. The impairment indicator primarily includes the declines in our operating cash flows from the use of these assets. If the impairment indicators are present, we are required to perform a recoverability test by comparing the sum of the estimated undiscounted future cash flows attributable to these long-lived assets to their carrying value. We performed the required recoverability test for intangible assets in the third quarter of the fiscal year ended June 30, 2020 and concluded that there was no impairment based on the assessment. As of December 31, 2020, there were no impairment indicators for purchased intangible assets. Amortization expense for purchased intangible assets for the periods indicated below was as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Amortization expense - Cost of revenues $ 38,738 $ 36,364 $ 75,778 $ 71,985 Amortization expense - Selling, general and administrative 12,301 20,257 25,730 42,513 Amortization expense - Research and development 31 131 62 162 Total $ 51,070 $ 56,752 $ 101,570 $ 114,660 Based on the purchased intangible assets gross carrying amount recorded as of December 31, 2020, the remaining estimated annual amortization expense is expected to be as follows: Fiscal year ending June 30: Amortization (In thousands) 2021 (remaining six months) $ 104,418 2022 208,186 2023 207,094 2024 204,577 2025 192,368 2026 and thereafter 301,041 Total $ 1,217,684

DEBT

DEBT	6 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
DEBT	DEBT The following table summarizes our debt as of December 31, 2020 and June 30, 2020: As of December 31, 2020 As of June 30, 2020 Amount Effective Amount Effective Fixed-rate 4.650% Senior Notes due on November 1, 2024 $ 1,250,000 4.682 % $ 1,250,000 4.682 % Fixed-rate 5.650% Senior Notes due on November 1, 2034 250,000 5.670 % 250,000 5.670 % Fixed-rate 4.100% Senior Notes due on March 15, 2029 800,000 4.159 % 800,000 4.159 % Fixed-rate 5.000% Senior Notes due on March 15, 2049 400,000 5.047 % 400,000 5.047 % Fixed-rate 3.300% Senior Notes due on March 1, 2050 750,000 3.302 % 750,000 3.302 % Revolving Credit Facility — — % 50,000 1.310 % Fixed-rate 3.47% Note Payable due on February 20, 2021 20,000 2.050 % — — % Fixed-rate 3.59% Note Payable due on February 20, 2022 20,000 2.300 % — — % Total 3,490,000 3,500,000 Unamortized discount/premium, net (7,421) (8,167) Unamortized debt issuance costs (21,114) (22,163) Total $ 3,461,465 $ 3,469,670 Reported as: Short-term debt $ 20,000 $ — Long-term debt 3,441,465 3,469,670 Total $ 3,461,465 $ 3,469,670 As of December 31, 2020, future minimum principal payments for our debt are as follows: $20.0 million in the third quarter of fiscal 2021, $20.0 million in fiscal year 2022, $1.25 billion in fiscal year 2025 and $2.20 billion after fiscal year 2026. Senior Notes and Debt Redemption: In February 2020, we issued $750.0 million aggregate principal amount of senior, unsecured long-term notes (the “2020 Senior Notes”). In March 2019 and November 2014, we issued $1.20 billion (the "2019 Senior Notes”) and $2.50 billion (the "2014 Senior Notes,” and together with the 2019 Senior Notes and the 2020 Senior Notes, the “Senior Notes”), respectively, aggregate principal amount of senior, unsecured long-term notes. In each of the second quarters of fiscal 2018 and 2020, we repaid $250.0 million of the 2014 Senior Notes and in the third quarter of fiscal 2020 we repaid another $500.0 million of the 2014 Senior Notes using the proceeds from the issuance of the 2020 Senior Notes, bringing the outstanding aggregate principal amount of the 2014 Senior Notes to $1.50 billion as of December 31, 2020. The interest rates for our Senior Notes are not subject to adjustment. Interest is payable as follows: semi-annually on March 1 and September 1 of each year for the 2020 Senior Notes; semi-annually on March 15 and September 15 of each year for the 2019 Senior Notes; and semi-annually on May 1 and November 1 of each year for the 2014 Senior Notes. The indenture for the Senior Notes (the “Indenture”) includes covenants that limit our ability to grant liens on our facilities and enter into sale and leaseback transactions, subject to certain allowances under which certain sale and leaseback transactions are not restricted. In certain circumstances involving a change of control followed by a downgrade of the rating of a series of Senior Notes by at least two of Moody’s, S&P and Fitch Inc., unless we have exercised our rights to redeem the Senior Notes of such series, we will be required to make an offer to repurchase all or, at the holder’s option, any part, of each holder’s Senior Notes of that series pursuant to the offer described below (the “Change of Control Offer”). In the Change of Control Offer, we will be required to offer payment in cash equal to 101% of the aggregate principal amount of Senior Notes repurchased plus accrued and unpaid interest, if any, on the Senior Notes repurchased, up to, but not including, the date of repurchase. Based on the trading prices of the Senior Notes on the applicable dates, the fair value of the Senior Notes as of December 31, 2020 and June 30, 2020 was approximately $4.14 billion and $4.01 billion, respectively. While the Senior Notes are recorded at cost, the fair value of the long-term debt was determined based on quoted prices in markets that are not active; accordingly, the long-term debt is categorized as Level 2 for purposes of the fair value measurement hierarchy. As of December 31, 2020, we were in compliance with all of our covenants under the Indenture associated with the Senior Notes. Revolving Credit Facility: We have in place a Credit Agreement (the “Credit Agreement”) providing for a $1.00 billion unsecured Revolving Credit Facility (the "Revolving Credit Facility") with a maturity date of November 30, 2023. During the fiscal year ended June 30, 2020, we borrowed $450.0 million from the Revolving Credit Facility and made principal payments of $400.0 million, $200.0 million of which were repayments in the third fiscal quarter of 2020 using a portion of the proceeds from the issuance of the 2020 Senior Notes. As of June 30, 2020, we had outstanding $50.0 million aggregate principal amount of borrowings under the Revolving Credit Facility. During the first fiscal quarter of 2021, we repaid the remaining $50.0 million aggregate principal balance so that as of December 31, 2020 we had no outstanding borrowings under the Revolving Credit Facility. We may borrow, repay and reborrow funds under the Revolving Credit Facility until the Maturity Date, at which time such Revolving Credit Facility will terminate, and all outstanding loans under such facility, together with all accrued and unpaid interest, must be repaid. We may prepay outstanding borrowings under the Revolving Credit Facility at any time without a prepayment penalty. Borrowings under the Revolving Credit Facility will bear interest, at our option, at either: (i) the Alternative Base Rate (“ABR”) plus a spread, which ranges from 0 bps to 75 bps, or (ii) the London Interbank Offered Rate (“LIBOR”) plus a spread, which ranges from 100 bps to 175 bps. The spreads under ABR and LIBOR are subject to adjustment in conjunction with credit rating downgrades or upgrades. We are also obligated to pay an annual commitment fee on the daily undrawn balance of the Revolving Credit Facility, which ranges from 10 bps to 25 bps, subject to an adjustment in conjunction with changes to our credit rating. As of December 31, 2020, we elected to pay interest on the borrowed amount under the Revolving Credit Facility at LIBOR plus a spread of 112.5 bps, and we pay an annual commitment fee of 12.5 bps on the daily undrawn balance of the Revolving Credit Facility. The Revolving Credit Facility requires us to maintain an interest expense coverage ratio as described in the Credit Agreement, on a quarterly basis, covering the trailing four consecutive fiscal quarters of no less than 3.50 to 1.00. In addition, we are required to maintain the maximum leverage ratio as described in the Credit Agreement, on a quarterly basis of 3.00 to 1.00, covering the trailing four consecutive fiscal quarters for each fiscal quarter, which can be increased to 4.00 to 1.00 for a period of time in connection with a material acquisition or a series of material acquisitions, as we elected to increase our maximum leverage ratio in connection with the Orbotech acquisition. As of December 31, 2020, our maximum allowed leverage ratio was 3.50 to 1.00. We were in compliance with all covenants under the Credit Agreement as of December 31, 2020. Notes Payable: In December 2020 we sold promissory notes to a financial institution, borrowing an aggregate principal amount of $40.0 million ("Notes Payable"). Of the aggregate amount borrowed, $20.0 million matures on February 20, 2021 and the balance of $20.0 million matures on February 20, 2022. The premium of $0.3 million from the sale of the Notes Payable is being amortized over the life of the debt. The net proceeds from the sale of the Notes Payable will be used for general corporate purposes. For additional details, refer to Note 8 “Debt” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020.

LEASES

LEASES	6 Months Ended
	Dec. 31, 2020
Leases [Abstract]
LEASES	LEASES We have operating leases for facilities, vehicles, and other equipment. Our facility leases are primarily used for administrative functions, research and development, manufacturing, and storage and distribution. Our finance leases are not material. Our existing leases do not contain significant restrictive provisions or residual value guarantees; however, certain leases contain provisions for payment of maintenance, real estate taxes, or insurance costs by us. Our leases have remaining lease terms ranging from less than one year to 16 years, including periods covered by options to extend the lease when it is reasonably certain that the option will be exercised. Lease expense was $10.0 million and $19.6 million for the three and six months ended December 31, 2020, respectively, and $9.1 million and $17.6 million for the three and six months ended December 31, 2019, respectively. Expense related to short-term leases, which are not recorded on the Condensed Consolidated Balance Sheets, was not material for the three and six months ended December 31, 2020 and 2019. As of December 31, 2020 and June 30, 2020, the weighted average remaining lease term was 4.8 years and 5.1 years, respectively, and the weighted average discount rate for operating leases was 1.80% and 1.99%, respectively. Supplemental cash flow information related to leases was as follows: Six Months Ended December 31, In thousands 2020 2019 Operating cash outflows from operating leases $ 19,253 $ 17,424 ROU assets obtained in exchange for new operating lease liabilities $ 20,584 $ 10,278 Maturities of lease liabilities as of December 31, 2020 were as follows: Fiscal year ending June 30: Amount 2021 (remaining six months) $ 17,727 2022 28,811 2023 19,987 2024 13,358 2025 11,242 2026 and thereafter 19,823 Total lease payments 110,948 Less imputed interest (5,285) Total $ 105,663 As of December 31, 2020, we did not have any material leases that had not yet commenced.

EQUITY, LONG-TERM INCENTIVE COM

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST	6 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST	EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTERESTEquity Incentive Program As of December 31, 2020, 10.3 million shares remained available for issuance under our 2004 Equity Incentive Plan (the “2004 Plan”). For details of the 2004 Plan refer to Note 10 “Equity, Long-Term Incentive Compensation Plans and Non-Controlling Interest” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020. Assumed Equity Plans As part of the Orbotech acquisition, we assumed outstanding equity incentive awards under the following Orbotech equity incentive plans: (i) Equity Remuneration Plan for Key Employees of Orbotech Ltd. and its Affiliates and Subsidiaries (as Amended and Restated in 2005), (ii) 2010 Equity-Based Incentive Plan, and (iii) 2015 Equity-Based Incentive Plan (each, an “Assumed Equity Plan” and collectively the “Assumed Equity Plans”). As of December 31, 2020, there were 89,963 shares of our common stock underlying the outstanding Assumed RSUs under the Assumed Equity Plans. For details on the Assumed Equity Plans refer to Note 10 “Equity, Long-Term Incentive Compensation Plans and Non-Controlling Interest” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020. Equity Incentive Plans - General Information The following table summarizes the combined activity under our equity incentive plans: (In thousands) Available For Grant (1) (2) Balance as of June 30, 2020 10,760 Restricted stock units granted (3) (619) Restricted stock units granted adjustment (4) 54 Restricted stock units canceled 88 Balance as of December 31, 2020 10,283 __________________ (1) The number of RSUs reflects the application of the award multiplier of 2.0x to calculate the impact of the award on the shares reserved under the 2004 Plan. (2) No additional stock options, RSUs or other awards will be granted under the Assumed Equity Plans. (3) Includes RSUs granted to senior management during the six months ended December 31, 2020 with performance-based vesting criteria (in addition to service-based vesting criteria for any of such RSUs that are deemed to have been earned) (“performance-based RSUs”). This line item includes all such performance-based RSUs granted during the six months ended December 31, 2020 reported at the maximum possible number of shares that may ultimately be issuable if all applicable performance-based criteria are achieved at their maximum levels and all applicable service-based criteria are fully satisfied (0.2 million shares for the six months ended December 31, 2020 reflects the application of the multiplier described above). (4) Represents the portion of RSUs granted with performance-based vesting criteria and reported at the actual number of shares issued upon achievement of the performance vesting criteria during the six months ended December 31, 2020. The fair value of stock-based awards is measured at the grant date and is recognized as an expense over the employee’s requisite service period. For RSUs granted without “dividend equivalent” rights, fair value is calculated using the closing price of our common stock on the grant date, adjusted to exclude the present value of dividends which are not accrued on those RSUs. The fair value for RSUs granted with “dividend equivalent” rights is determined using the closing price of our common stock on the grant date. Compensation expense for RSUs with performance metrics is calculated based upon expected achievement of the metrics specified in the grant, or when a grant contains a market condition, the grand date fair value using a Monte Carlo simulation. The fair value for purchase rights under our Employee Stock Purchase Plan is determined using a Black-Scholes model. The following table shows stock-based compensation expense for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Stock-based compensation expense by: Costs of revenues $ 4,104 $ 3,362 $ 7,771 $ 6,226 Research and development 5,225 5,073 10,696 10,360 Selling, general and administrative 17,498 18,354 35,352 37,147 Total stock-based compensation expense $ 26,827 $ 26,789 $ 53,819 $ 53,733 The following table shows stock-based compensation capitalized as inventory as of the dates indicated below: As of As of (In thousands) December 31, 2020 June 30, 2020 Inventory $ 5,855 $ 6,752 Restricted Stock Units The following table shows the activity and weighted-average grant date fair value for RSUs during the six months ended December 31, 2020: Shares (1) (In thousands) Weighted-Average Outstanding restricted stock units as of June 30, 2020 (2) 2,253 $ 107.33 Granted (3) 309 $ 202.60 Granted adjustments (27) $ 88.96 Vested and released (341) $ 98.54 Withheld for taxes (172) $ 98.54 Forfeited (51) $ 117.20 Outstanding restricted stock units as of December 31, 2020 (2) 1,971 $ 124.58 __________________ (1) Share numbers reflect actual shares subject to awarded RSUs. (2) Includes performance-based and market-based RSUs. (3) This line item includes performance-based RSUs granted during the six months ended December 31, 2020 reported at the maximum possible number of shares that may ultimately be issuable if all applicable performance-based criteria are achieved at their maximum levels and all applicable service-based criteria are fully satisfied (0.1 million shares for the six months ended December 31, 2020). The RSUs granted by us generally vest (a) with respect to awards with only service-based vesting criteria, over periods ranging from two The following table shows the weighted-average grant date fair value per unit for the RSUs granted, vested, and tax benefits realized by us in connection with vested and released RSUs for the indicated periods : Three Months Ended Six Months Ended December 31, December 31, (In thousands, except for weighted-average grant date fair value) 2020 2019 2020 2019 Weighted-average grant date fair value per unit $ 220.53 $ 171.98 $ 202.60 $ 142.75 Grant date fair value of vested restricted stock units $ 23,267 $ 26,643 $ 50,569 $ 56,736 Tax benefits realized by us in connection with vested and released restricted stock units $ 6,694 $ 9,661 $ 13,431 $ 13,654 As of December 31, 2020, the unrecognized stock-based compensation expense balance related to RSUs was $165.0 million, excluding the impact of estimated forfeitures, and will be recognized over a weighted-average remaining contractual term and an estimated weighted-average amortization period of 1.6 years. The intrinsic value of outstanding RSUs as of December 31, 2020 was $510.3 million. Cash-Based Long-Term Incentive Compensation We have adopted a cash-based long-term incentive program (“Cash LTI Plan”) for many of our employees as part of our employee compensation program. Executives and non-employee members of the Board of Directors do not participate in this program. During the six months ended December 31, 2020 and 2019, we approved Cash LTI awards of $4.1 million and $4.3 million, respectively, under our Cash LTI Plan. Cash LTI awards issued to employees under the Cash LTI Plan will vest in three or four equal installments, with one-third or one-fourth of the aggregate amount of the Cash LTI award vesting on each anniversary of the grant date over a three Employee Stock Purchase Plan Our Employee Stock Purchase Plan (“ESPP”) provides that eligible employees may contribute up to 15% of their eligible earnings toward the semi-annual purchase of our common stock. The ESPP is qualified under Section 423 of the Internal Revenue Code. The employee’s purchase price is derived from a formula based on the closing price of the common stock on the first day of the offering period versus the closing price on the date of purchase (or, if not a trading day, on the immediately preceding trading day). The offering period (or length of the look-back period) under the ESPP has a duration of six months, and the purchase price with respect to each offering period beginning on or after such date is, until otherwise amended, equal to 85% of the lesser of (i) the fair market value of our common stock at the commencement of the applicable six-month offering period or (ii) the fair market value of our common stock on the purchase date. We estimate the fair value of purchase rights under the ESPP using a Black-Scholes model. The fair value of each purchase right under the ESPP was estimated on the date of grant using the Black-Scholes model and the straight-line attribution approach with the following weighted-average assumptions: Three Months Ended Six Months Ended December 31, December 31, 2020 2019 2020 2019 Stock purchase plan: Expected stock price volatility 51.9 % 31.6 % 51.9 % 31.6 % Risk-free interest rate 0.7 % 2.4 % 0.7 % 2.4 % Dividend yield 1.9 % 2.5 % 1.9 % 2.5 % Expected life (in years) 0.5 0.5 0.5 0.5 The following table shows total cash received from employees for the issuance of shares under the ESPP, the number of shares purchased by employees through the ESPP, the tax benefits realized by us in connection with the disqualifying dispositions of shares purchased under the ESPP and the weighted-average fair value per share for the indicated periods: Three Months Ended Six Months Ended (In thousands, except for weighted-average fair value per share) December 31, December 31, 2020 2019 2020 2019 Total cash received from employees for the issuance of shares under the ESPP $ 26,356 $ 24,492 $ 26,356 $ 24,492 Number of shares purchased by employees through the ESPP 161 237 161 237 Tax benefits realized by us in connection with the disqualifying dispositions of shares purchased under the ESPP $ (3,005) $ 119 $ 1,164 $ 1,853 Weighted-average fair value per share based on Black-Scholes model $ 52.23 $ 27.35 $ 52.23 $ 27.35 The ESPP shares are replenished annually on the first day of each fiscal year by virtue of an evergreen provision. The provision allows for share replenishment equal to the lesser of 2.0 million shares or the number of shares which we estimate will be required to be issued under the ESPP during the forthcoming fiscal year. As of December 31, 2020, a total of 2.5 million shares were reserved and available for issuance under the ESPP. Quarterly Cash Dividends On November 5, 2020, we announced that our Board of Directors had declared a quarterly cash dividend of $0.90 per share to be paid on December 1, 2020 to stockholders of record as of the close of business on November 16, 2020. The total amount of regular quarterly cash dividends and dividend equivalents paid during the three months ended December 31, 2020 and 2019 was $139.6 million and $134.7 million, respectively. The total amount of regular quarterly cash dividends and dividend equivalents paid during the six months ended December 31, 2020 and 2019 was $280.7 million and $256.3 million, respectively. The amount of accrued dividend equivalents payable for regular quarterly cash dividends on unvested RSUs with dividend equivalent rights as of December 31, 2020 and June 30, 2020 was $9.5 million and $8.3 million, respectively. These amounts will be paid upon vesting of the underlying RSUs. Non-Controlling Interest We have consolidated the results of Orbograph Ltd. (“Orbograph”), in which we own approximately 94% of the outstanding equity interest. Orbograph is engaged in the development and marketing of character recognition solutions to banks, financial and other payment processing institutions and healthcare providers. During the fourth quarter of fiscal 2020, we entered into an Asset Purchase Agreement to sell certain core assets of our non-strategic solar energy business, Orbotech LT Solar, LLC ("OLTS"). The sale was completed in the first quarter of fiscal 2021 and the proceeds were not material. We consolidate the results of OLTS, of which we own 97% of the outstanding equity interest as of December 31, 2020. OLTS was engaged in the research, development and marketing of products for the deposition of thin film coating of various materials on crystalline silicon photovoltaic wafers for solar energy panels through plasma-enhanced chemical vapor deposition (“PECVD”). Additionally, we have consolidated the results of PixCell Medical Technologies, Ltd. ("PixCell"), an Israeli company that is engaged in the development, marketing and sales of diagnostic equipment for point-of-care hematology applications of which we own approximately 52% of the outstanding equity interest and are entitled to appoint the majority of this company’s directors. In December 2020, we entered into a Share Purchase Agreement to sell our entire interest in PixCell for proceeds of approximately $21 million. This transaction is expected to be completed during the third quarter of fiscal 2021.

STOCK REPURCHASE PROGRAM

STOCK REPURCHASE PROGRAM	6 Months Ended
	Dec. 31, 2020
Equity [Abstract]
STOCK REPURCHASE PROGRAM	STOCK REPURCHASE PROGRAM Our Board of Directors has authorized a program which permits us to repurchase up to $3.00 billion of our common stock. The intent of this program is to offset the dilution from our equity incentive plans, shares issued in connection with purchases under our ESPP, the issuance of shares in the Orbotech Acquisition, as well as to return excess cash to our stockholders. Subject to market conditions, applicable legal requirements and other factors, the repurchases were made in the open market in compliance with applicable securities laws, including the Securities Exchange Act of 1934 and the rules promulgated thereunder, such as Rule 10b-18 and, if pursuant to a written plan, Rule 10b5-1. This stock repurchase program has no expiration date and may be suspended at any time. As of December 31, 2020, an aggregate of approximately $0.67 billion was available for repurchase under the stock repurchase program. Share repurchases for the indicated periods (based on the trade date of the applicable repurchase) were as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Number of shares of common stock repurchased 774 1,690 1,801 3,349 Total cost of repurchases $ 177,492 $ 280,593 $ 371,389 $ 509,089

NET INCOME PER SHARE

NET INCOME PER SHARE	6 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
NET INCOME PER SHARE	NET INCOME PER SHARE Basic net income per share is calculated by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net income per share is calculated by using the weighted-average number of common shares outstanding during the period, increased to include the number of additional shares of common stock that would have been outstanding if the shares of common stock underlying our outstanding dilutive restricted stock units had been issued. The dilutive effect of outstanding restricted stock units is reflected in diluted net income per share by application of the treasury stock method. The following table sets forth the computation of basic and diluted net income per share attributable to KLA: Three Months Ended Six Months Ended (In thousands, except per share amounts) December 31, December 31, 2020 2019 2020 2019 Numerator: Net income attributable to KLA $ 457,251 $ 380,555 $ 877,818 $ 727,080 Denominator: Weighted-average shares - basic, excluding unvested restricted stock units 154,273 157,290 154,777 157,994 Effect of dilutive restricted stock units and options 1,287 1,330 1,280 1,320 Weighted-average shares - diluted 155,560 158,620 156,057 159,314 Basic net income per share attributable to KLA $ 2.96 $ 2.42 $ 5.67 $ 4.60 Diluted net income per share attributable to KLA $ 2.94 $ 2.40 $ 5.62 $ 4.56 Anti-dilutive securities excluded from the computation of diluted net income per share — 43 — 25

INCOME TAXES

INCOME TAXES	6 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table provides details of income taxes: Three Months Ended Six Months Ended December 31, December 31, (Dollar amounts in thousands) 2020 2019 2020 2019 Income before income taxes $ 527,402 $ 424,927 $ 1,011,208 $ 796,443 Provision for income taxes $ 70,419 $ 44,622 $ 134,083 $ 69,742 Effective tax rate 13.4 % 10.5 % 13.3 % 8.8 % Our effective tax rate is lower than the U.S. federal statutory rate during the three and six months ended December 31, 2020 primarily due to the proportion of earnings generated in jurisdictions with tax rates lower than the U.S. statutory rate and the proportion of the U.S. earnings eligible for the Foreign Derived Intangible Income deduction. The Foreign Derived Intangible Income deduction reduces the U.S. tax rate on sales to customers outside the U.S. In the normal course of business, we are subject to examination by tax authorities throughout the world. We are subject to United States income tax examinations for all years beginning from the fiscal year ended June 30, 2017 and are under United States income tax examination for the fiscal year ended June 30, 2018. We are subject to state income tax examinations for all years beginning from the fiscal year ended June 30, 2016. We are also subject to examinations in other major foreign jurisdictions, including Singapore and Israel, for all years beginning from the calendar year ended December 31, 2012. We are under audit in Germany related to Orbotech for the calendar years ended December 31, 2013 to December 31, 2015. We are also under audit in Israel related to KLA for the fiscal years ended June 30, 2017 to June 30, 2019. It is possible that certain examinations may be concluded in the next twelve months. The timing and resolution of income tax examinations is uncertain. The amounts paid, if any, upon resolution of issues raised by the taxing authorities may differ materially from the amounts accrued for each year. Although it is possible that our balance of gross unrecognized tax benefits could materially change in the next 12 months, we are unable to estimate the full range of possible adjustments to this balance given the uncertainty in the development of ongoing income tax examinations. In May 2017, Orbotech received an assessment from the Israel Tax Authority (“ITA”) with respect to its fiscal years 2012 through 2014 (the “Assessment”), for an aggregate amount of tax, after offsetting all net operating losses (“NOLs”) available through the end of 2014, of approximately NIS 229.0 million (equivalent to approximately $66.0 million which includes related interest and linkage differentials to the Israeli consumer price index as of date of the issuance of the Tax Decrees, as defined below). On August 31, 2018, Orbotech filed an objection in respect of the Assessment (the “Objection”). The ITA completed the second stage of the audit, in which the claims Orbotech raised in the Objection were examined by different personnel at the ITA. In addition, the ITA examined additional items during this second stage of the audit. As Orbotech and the ITA did not reach an agreement during the second stage, the ITA issued Tax Decrees to Orbotech on August 28, 2019 (“Tax Decrees”) for an aggregate amount of tax, after offsetting all NOLs available through the end of 2014, of approximately NIS 257.0 million (equivalent to approximately $73.0 million which includes related interest and linkage differentials to the Israeli consumer price index as of the date of the issuance of the Tax Decrees). These Tax Decrees replaced the Assessment. We believe that our recorded unrecognized tax benefits are sufficient to cover the resolution of these Tax Decrees. Orbotech filed a notice of appeal with respect to the above Tax Decrees with the District Court of Tel Aviv on September 26, 2019. On February 27, 2020 the ITA filed its arguments in support of the Tax Decrees. Orbotech filed the grounds of appeal with respect to the above Tax Decrees on July 30, 2020. We are currently in the pre-trial hearing stage of the process and the next pre-trial meeting is scheduled for April 2021. The ITA and Orbotech are continuing discussions in an effort to resolve this matter in a mutually agreeable manner. In connection with the above, there is an ongoing criminal investigation in Israel against Orbotech, certain of its employees and its tax consultant. On April 11, 2018, Orbotech received a “suspect notification letter” (dated March 28, 2018) from the Tel Aviv District Attorney’s Office (Fiscal and Financial). In the letter, it was noted that the investigation file was transferred from the Assessment Investigation Officer to the District Attorney’s Office. The letter further states that the District Attorney’s Office has not yet made a decision regarding submission of an indictment against Orbotech; and that if after studying the case, a decision is made to consider prosecuting Orbotech, Orbotech will receive an additional letter and, within 30 days, Orbotech may present its arguments to the District Attorney’s Office as to why it should not be indicted. On October 27, 2019, we received a request for additional information from the District Attorney's Office. We will continue to monitor the progress of the District Attorney’s Office investigation; however, we cannot anticipate when the review of the case will be completed and what will be the results thereof. We intend to cooperate with the District Attorney’s Office to enable them to conclude their investigation. In December 2020, Orbotech received an assessment from the ITA with respect to its fiscal years 2015 through 2018 (the “Second Assessment”) for an aggregate amount of tax, after offsetting all NOLs available through the end of 2018, of approximately NIS 227.0 million (equivalent to approximately $68.0 million which includes related interest and linkage differentials to the Israeli consumer price index as of date of the issuance of the Second Assessment). We are filing an objection to the Second Assessment with the ITA. The objection will result in moving the 2015-2018 audit to the second stage, in which the ITA will review the objections. We believe that our recorded unrecognized tax benefits are sufficient to cover the resolution of the Second Assessment.

LITIGATION AND OTHER LEGAL MATT

LITIGATION AND OTHER LEGAL MATTERS	6 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
LITIGATION AND OTHER LEGAL MATTERS	LITIGATION AND OTHER LEGAL MATTERSWe are named from time to time as a party to lawsuits and other types of legal proceedings and claims in the normal course of our business. Actions filed against us include commercial, intellectual property, customer, and labor and employment related claims, including complaints of alleged wrongful termination and potential class action lawsuits regarding alleged violations of federal and state wage and hour and other laws. In general, legal proceedings and claims, regardless of their merit, and associated internal investigations (especially those relating to intellectual property or confidential information disputes) are often expensive to prosecute, defend or conduct and may divert management’s attention and other company resources. Moreover, the results of legal proceedings are difficult to predict, and the costs incurred in litigation can be substantial, regardless of outcome. We believe the amounts provided in our Condensed Consolidated Financial Statements are adequate in light of the probable and estimated liabilities. However, because such matters are subject to many uncertainties, and the ultimate outcomes are not predictable, there can be no assurances that the actual amounts required to satisfy alleged liabilities from the matters described above will not exceed the amounts reflected in our Condensed Consolidated Financial Statements or will not have a material adverse effect on our results of operations, financial condition or cash flows.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Factoring. We have agreements (referred to as “factoring agreements”) with financial institutions to sell certain of our trade receivables and promissory notes from customers without recourse. We do not believe we are at risk for any material losses as a result of these agreements. In addition, we periodically sell certain letters of credit (“LCs”), without recourse, received from customers in payment for goods and services. The following table shows total receivables sold under factoring agreements and proceeds from sales of LCs for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Receivables sold under factoring agreements $ 49,917 $ 116,935 $ 138,562 $ 173,355 Proceeds from sales of LCs $ 21,709 $ 10,677 $ 40,839 $ 20,606 Factoring and LC fees for the sale of certain trade receivables were recorded in other expense (income), net and were not material for the periods presented. Purchase Commitments. We maintain commitments to purchase inventory from our suppliers as well as goods, services, and other assets in the ordinary course of business. Our liability under these purchase commitments is generally restricted to a forecasted time-horizon as mutually agreed upon between the parties. This forecasted time-horizon can vary among different suppliers. Our estimate of our significant purchase commitments for primarily material, services, supplies and asset purchases is approximately $994.9 million as of December 31, 2020, which are primarily due within the next 12 months. Actual expenditures will vary based upon the volume of the transactions and length of contractual service provided. In addition, the amounts paid under these arrangements may be less in the event that the arrangements are renegotiated or canceled. Certain agreements provide for potential cancellation penalties. Cash Long-Term Incentive Plan. As of December 31, 2020, we have committed $188.7 million for future payment obligations under our Cash LTI Plan. The calculation of compensation expense related to the Cash LTI Plan includes estimated forfeiture rate assumptions. Cash LTI awards issued to employees under the Cash LTI Plan vest in three or four equal installments, with one-third or one-fourth of the aggregate amount of the Cash LTI award vesting on each anniversary of the grant date over a three Guarantees and Contingencies. We maintain guarantee arrangements available through various financial institutions for up to $73.8 million, of which $62.8 million had been issued as of December 31, 2020, primarily to fund guarantees to customs authorities for value-added tax (“VAT”) and other operating requirements of our subsidiaries in Europe, Israel and Asia. Indemnification Obligations. Subject to certain limitations, we are obligated to indemnify our current and former directors, officers and employees with respect to certain litigation matters and investigations that arise in connection with their service to us. These obligations arise under the terms of our certificate of incorporation, our bylaws, applicable contracts, and Delaware and California law. The obligation to indemnify generally means that we are required to pay or reimburse the individuals’ reasonable legal expenses and possibly damages and other liabilities incurred in connection with these matters. For example, we have paid or reimbursed legal expenses incurred in connection with the investigation of our historical stock option practices and the related litigation and government inquiries by several of our current and former directors, officers and employees. Although the maximum potential amount of future payments we could be required to make under the indemnification obligations generally described in this paragraph is theoretically unlimited, we believe the fair value of this liability, to the extent estimable, is appropriately considered within the reserve we have established for currently pending legal proceedings. We are a party to a variety of agreements pursuant to which we may be obligated to indemnify the other party with respect to certain matters. Typically, these obligations arise in connection with contracts and license agreements or the sale of assets, under which we customarily agree to hold the other party harmless against losses arising from, or provides customers with other remedies to protect against, bodily injury or damage to personal property caused by our products, non-compliance with our product performance specifications, infringement by our products of third-party intellectual property rights and a breach of warranties, representations and covenants related to matters such as title to assets sold, validity of certain intellectual property rights, non-infringement of third-party rights, and certain income tax-related matters. In each of these circumstances, payment by us is typically subject to the other party making a claim to and cooperating with us pursuant to the procedures specified in the particular contract. This usually allows us to challenge the other party’s claims or, in case of breach of intellectual property representations or covenants, to control the defense or settlement of any third-party claims brought against the other party. Further, our obligations under these agreements may be limited in terms of amounts, activity (typically at our option to replace or correct the products or terminate the agreement with a refund to the other party), and duration. In some instances, we may have recourse against third parties and/or insurance covering certain payments made by us. In addition, we may in limited circumstances enter into agreements that contain customer-specific commitments on pricing, tool reliability, spare parts stocking levels, response time and other commitments. Furthermore, we may give these customers limited audit or inspection rights to enable them to confirm that we are complying with these commitments. If a customer elects to exercise its audit or inspection rights, we may be required to expend significant resources to support the audit or inspection, as well as to defend or settle any dispute with a customer that could potentially arise out of such audit or inspection. To date, we have made no significant accruals in our Condensed Consolidated Financial Statements for this contingency. While we have not in the past incurred significant expenses for resolving disputes regarding these types of commitments, we cannot make any assurance that we will not incur any such liabilities in the future. It is not possible to predict the maximum potential amount of future payments under these or similar agreements due to the conditional nature of our obligations and the unique facts and circumstances involved in each particular agreement. Historically, payments made by us under these agreements have not had a material effect on our business, financial condition, results of operations or cash flows.

DERIVATIVE INSTRUMENTS AND HEDG

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	6 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The authoritative guidance requires companies to recognize all derivative instruments and hedging activities, including foreign currency exchange contracts and interest rate lock agreements, (collectively “derivatives”) as either assets or liabilities at fair value on the Condensed Consolidated Balance Sheets. In accordance with the accounting guidance, we designate foreign currency exchange contracts and interest rate lock agreements as cash flow hedges of certain forecasted foreign currency denominated sales, purchase and spending transactions, and the benchmark interest rate of the corresponding debt financing, respectively. Our foreign subsidiaries operate and sell our products in various global markets. As a result, we are exposed to risks relating to changes in foreign currency exchange rates. We utilize foreign currency forward exchange contracts and option contracts to hedge against future movements in foreign exchange rates that affect certain existing and forecasted foreign currency denominated sales and purchase transactions, such as the Japanese yen, the euro, the pound sterling and the Israeli new shekel. We routinely hedge our exposures to certain foreign currencies with various financial institutions in an effort to minimize the impact of certain currency exchange rate fluctuations. These currency forward exchange contracts and options, designated as cash flow hedges, generally have maturities of less than 18 months. Cash flow hedges are evaluated for effectiveness monthly, based on changes in total fair value of the derivatives. If a financial counterparty to any of our hedging arrangements experiences financial difficulties or is otherwise unable to honor the terms of the foreign currency hedge, we may experience material losses. In January 2020, we entered into a series of forward contracts (the “2020 Rate Lock Agreements”) with a notional amount of $350.0 million in aggregate to lock the benchmark interest rate on a portion of the 2020 Senior Notes. The 2020 Rate Lock Agreements were terminated on the date of the pricing of the 2020 Senior Notes and we recorded the fair value of $21.5 million as a loss within accumulated other comprehensive income (loss) (“OCI”) as of March 31, 2020, which is being amortized over the life of the debt. We entered into similar forward contracts in prior years to lock the benchmark interest rates prior to expected debt issuances, for which the original fair values of $13.6 million loss in fiscal 2019 and $7.5 million gain in fiscal 2015 were recognized in OCI, and are being amortized to interest expense over the lives of the associated debt. We recognized a net expense of $0.3 million and $0.6 million for the three and six months ended December 31, 2020, respectively, and a net expense of $0.1 million and $0.2 million for the three and six months ended December 31, 2019, respectively, for the amortization of the net of the three rate lock agreements that had been recognized in accumulated OCI, which increased the interest expense on a net basis. As of December 31, 2020, the aggregate unamortized portion of the fair value of the forward contracts for the Rate Lock Agreements was $29.6 million. For derivatives that are designated and qualify as cash flow hedges, the effective portion of the gains or losses is reported in OCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Prior to adopting the new accounting guidance for hedge accounting, time value was excluded from the assessment of effectiveness for derivatives designated as cash flow hedges. Time value was amortized on a mark-to-market basis and recognized in earnings over the life of the derivative contract. For derivative contracts executed after adopting the new accounting guidance, the election to include time value for the assessment of effectiveness is made on all forward contracts designated as cash flow hedges. The change in fair value of the derivative is recorded in OCI until the hedged item is recognized in earnings. The assessment of effectiveness of options contracts designated as cash flow hedges continue to exclude time value after adopting the new accounting guidance. The initial value of the component excluded from the assessment of effectiveness is recognized in earnings over the life of the derivative contract. Any difference between change in the fair value of the excluded components and the amounts recognized in earnings are recorded in OCI. For derivatives that are not designated as cash flow hedges, gains and losses are recognized in other expense (income), net. We use foreign currency forward contracts to hedge certain foreign currency denominated assets or liabilities. The gains and losses on these derivative instruments are largely offset by the changes in the fair value of the assets or liabilities being hedged. Derivatives in Cash Flow Hedging Relationships: Foreign Exchange and Interest Rate Contracts The gains (losses) on derivatives in cash flow hedging relationships recognized in OCI for the indicated periods were as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Derivatives Designated as Hedging Instruments: Foreign exchange contracts: Amounts included in the assessment of effectiveness $ (1,310) $ 2,305 $ (2,182) 1,565 Amounts excluded from the assessment of effectiveness $ (47) $ (15) $ (93) $ (17) The locations and amounts of designated and non-designated derivative’s gains and losses reported in the Condensed Consolidated Statements of Operations for the indicated periods were as follows: Three Months Ended December 31, Three Months Ended December 31, 2020 2019 (In thousands) Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Total amounts presented in the Condensed Consolidated Statements of Operations in which the effects of cash flow hedges are recorded $ 1,650,870 $ 1,080,706 $ 38,880 $ 3,882 $ 1,509,453 $ 1,046,622 $ 40,472 $ (2,568) Gains (losses) on Derivatives Designated as Hedging Instruments: Rate lock agreements: Amount of gains (losses) reclassified from accumulated OCI to earnings $ — $ — $ (279) $ — $ — $ — $ (100) $ — Foreign exchange contracts: Amount of gains (losses) reclassified from accumulated OCI to earnings $ (560) $ (125) $ — $ — $ 85 $ (17) $ — $ — Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach $ (151) $ — $ — $ — $ (93) $ — $ — $ — Gains (losses) on Derivatives Not Designated as Hedging Instruments: Amount of gains (losses) recognized in earnings $ — $ — $ — $ 2,661 $ — $ — $ — $ 2,056 Six Months Ended December 31, Six Months Ended December 31, 2020 2019 (In thousands) Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Total amounts presented in the Condensed Consolidated Statement of Operations in which the effects of cash flow hedges are recorded $ 3,189,490 $ 2,092,937 $ 78,266 $ 7,079 $ 2,922,867 $ 2,049,788 $ 80,822 $ (4,186) Gains (losses) on Derivatives Designated as Hedging Instruments: Rate lock agreements: Amount of gains (losses) reclassified from accumulated OCI to earnings $ — $ — $ (558) $ — $ — $ — $ (199) $ — Foreign exchange contracts: Amount of gains (losses) reclassified from accumulated OCI to earnings $ (650) $ 425 $ — $ — $ 560 $ (1,818) $ — $ — Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach $ (278) $ — $ — $ — $ (195) $ — $ — $ — Gains (losses) on Derivatives Not Designated as Hedging Instruments: Amount of gains (losses) recognized in earnings $ — $ — $ — $ (2,937) $ — $ — $ — $ 4,381 The U.S. dollar equivalent of all outstanding notional amounts of foreign currency hedge contracts, with maximum remaining maturities of approximately thirteen months as of the dates indicated below were as follows: As of As of (In thousands) December 31, 2020 June 30, 2020 Cash flow hedge contracts - foreign currency Purchase $ 8,344 $ 10,705 Sell $ 95,706 $ 71,431 Other foreign currency hedge contracts Purchase $ 311,397 $ 329,310 Sell $ 321,076 $ 357,939 The locations and fair value of our derivatives reported in our Condensed Consolidated Balance Sheets as of the dates indicated below were as follows: Asset Derivatives Liability Derivatives Balance Sheet As of As of Balance Sheet As of As of Location December 31, 2020 June 30, 2020 Location December 31, 2020 June 30, 2020 (In thousands) Fair Value Fair Value Derivatives designated as hedging instruments Foreign exchange contracts Other current assets $ 311 $ 680 Other current liabilities $ 981 $ 45 Total derivatives designated as hedging instruments 311 680 981 45 Derivatives not designated as hedging instruments Foreign exchange contracts Other current assets 2,349 1,397 Other current liabilities 2,860 1,365 Total derivatives not designated as hedging instruments 2,349 1,397 2,860 1,365 Total derivatives $ 2,660 $ 2,077 $ 3,841 $ 1,410 The changes in OCI, before taxes, related to derivatives for the indicated periods were as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Beginning balance $ (30,574) $ (10,006) $ (29,602) $ (10,791) Amount reclassified to earnings 1,115 125 1,061 1,652 Net change in unrealized gains or losses (1,357) 2,290 (2,275) 1,548 Ending balance $ (30,816) $ (7,591) $ (30,816) $ (7,591) Offsetting of Derivative Assets and Liabilities We present derivatives at gross fair values in the Condensed Consolidated Balance Sheets. We have entered into arrangements with each of our counterparties, which reduce credit risk by permitting net settlement of transactions with the same counterparty under certain conditions. The information related to the offsetting arrangements for the periods indicated was as follows (in thousands): As of December 31, 2020 Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets Description Gross Amounts of Derivatives Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets Net Amount of Derivatives Presented in the Condensed Consolidated Balance Sheets Financial Instruments Cash Collateral Received Net Amount Derivatives - Assets $ 2,660 $ — $ 2,660 $ (1,527) $ — $ 1,133 Derivatives - Liabilities $ (3,841) $ — $ (3,841) $ 1,527 $ — $ (2,314) As of June 30, 2020 Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets Description Gross Amounts of Derivatives Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets Net Amount of Derivatives Presented in the Condensed Consolidated Balance Sheets Financial Instruments Cash Collateral Received Net Amount Derivatives - Assets $ 2,077 $ — $ 2,077 $ (1,020) $ — $ 1,057 Derivatives - Liabilities $ (1,410) $ — $ (1,410) $ 1,020 $ — $ (390)

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	6 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS During the three and six months ended December 31, 2020 and 2019, we purchased from, or sold to, several entities, where one or more of our executive officers or members of our Board of Directors, or their immediate family members, were, during the periods presented, an executive officer or a board member of a subsidiary, or in the case of The Vanguard Group, Inc. beneficially owns more than 10% of our outstanding stock, including Anaplan, Inc., Citrix Systems, Inc., HP Inc., Keysight Technologies, Inc. and Proofpoint, Inc. The following table provides the transactions with these parties for the indicated periods (for the portion of such period that they were considered related): Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Total revenues $ 324 $ 2,794 $ 638 $ 3,835 Total purchases $ 279 $ 249 $ 571 $ 714

SEGMENT REPORTING AND GEOGRAPHI

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION	6 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
SEGMENT REPORTING AND GEOGRAPHIC INFORMATION	SEGMENT REPORTING AND GEOGRAPHIC INFORMATION ASC 280, Segment Reporting, establishes standards for reporting information about operating segments. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance. Our CODM is our Chief Executive Officer. We have four reportable segments: Semiconductor Process Control; Specialty Semiconductor Process; PCB, Display and Component Inspection; and Other. The reportable segments are determined based on several factors including, but not limited to, customer base, homogeneity of products, technology, delivery channels and similar economic characteristics. Semiconductor Process Control The Semiconductor Process Control (“SPC”) segment offers a comprehensive portfolio of inspection, metrology and data analytics products, and related service, which helps integrated circuit ("ICs") manufacturers achieve target yield throughout the entire semiconductor fabrication process-from research and development (“R&D”) to final volume production. Our differentiated products and services are designed to provide comprehensive solutions that help our customers accelerate development and production ramp cycles, achieve higher and more stable semiconductor die yields and improve their overall profitability. This reportable segment is comprised of two operating segments, Wafer Inspection and Patterning and GSS. Specialty Semiconductor Process The Specialty Semiconductor Manufacturing segment develops and sells advanced vacuum deposition and etching process tools, which are used by a broad range of specialty semiconductor customers, including manufacturers of microelectromechanical systems (“MEMS”), radio frequency (“RF”) communication chips, and power semiconductors for automotive and industrial applications. This reportable segment is comprised of one operating segment. PCB, Display and Component Inspection The PCB, Display and Component Inspection segment enables electronic device manufacturers to inspect, test and measure printed circuit boards (“PCBs”), flat panel displays (“FPDs”) and ICs to verify their quality, pattern the desired electronic circuitry on the relevant substrate and perform three-dimensional shaping of metalized circuits on multiple surfaces. This segment also engages in the development and marketing of character recognition solutions to banks, financial and other payment processing institutions and healthcare providers. This reportable segment is comprised of two operating segments, PCB and Display and Component Inspection. Other During the fourth quarter of fiscal 2020, we entered into an Asset Purchase Agreement to sell certain core assets of our non-strategic solar energy business, which was included in our Other reportable segment. This reportable segment remains comprised of one operating segment. The CODM assesses the performance of each operating segment and allocates resources to those segments based on total revenues and segment gross margin and does not evaluate the segments using discrete asset information. Segment gross margin excludes corporate allocations and effects of foreign exchange rates, amortization of intangible assets, amortization of inventory fair value adjustments, and transaction costs associated with our acquisitions related to costs of revenues. The following is a summary of results for each of our four reportable segments for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Semiconductor Process Control: Revenues $ 1,380,184 $ 1,247,430 $ 2,648,138 $ 2,411,062 Segment gross margin 884,090 795,730 1,698,900 1,538,072 Specialty Semiconductor Process: Revenues 90,587 75,106 179,540 144,245 Segment gross margin 51,171 41,333 101,099 79,497 PCB, Display and Component Inspection: Revenues 179,267 186,279 360,444 364,831 Segment gross margin 84,584 82,538 174,753 158,606 Other: Revenues 449 517 590 2,748 Segment gross margin (121) 117 (108) 770 Totals: Revenues for reportable segments $ 1,650,487 $ 1,509,332 $ 3,188,712 $ 2,922,886 Segment gross margin $ 1,019,724 $ 919,718 $ 1,974,644 $ 1,776,945 The following table reconciles total reportable segment revenues to total revenues for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Total revenues for reportable segments $ 1,650,487 $ 1,509,332 $ 3,188,712 $ 2,922,886 Corporate allocations and effects of foreign exchange rates 383 121 778 (19) Total revenues $ 1,650,870 $ 1,509,453 $ 3,189,490 $ 2,922,867 The following table reconciles total segment gross margin to total income before income taxes for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Total segment gross margin $ 1,019,724 $ 919,718 $ 1,974,644 $ 1,776,945 Acquisition-related charges, corporate allocations, and effects of foreign exchange rates (1) 38,587 43,883 75,449 91,937 Research and development 229,064 220,751 448,102 431,331 Selling, general and administrative 181,909 192,253 354,540 380,598 Interest expense 38,880 40,472 78,266 80,822 Other expense (income), net 3,882 (2,568) 7,079 (4,186) Income before income taxes $ 527,402 $ 424,927 $ 1,011,208 $ 796,443 __________________ (1) Acquisition-related charges primarily include amortization of intangible assets and amortization of inventory fair value adjustments presented as part of costs of revenues. Our significant operations outside the United States include manufacturing facilities in China, Germany, Israel and Singapore and sales, marketing and service offices in Japan, the rest of the Asia Pacific region and Europe. For geographical revenue reporting, revenues are attributed to the geographic location in which the customer is located. Long-lived assets consist of land, property and equipment, net and are attributed to the geographic region in which they are located. The following is a summary of revenues by geographic region, based on ship-to location, for the indicated periods: (Dollar amounts in thousands) Three Months Ended December 31, Six Months Ended December 31, 2020 2019 2020 2019 Revenues: China $ 382,157 23 % $ 381,752 25 % $ 868,246 27 % $ 727,608 25 % Taiwan 380,785 23 % 447,083 30 % 749,886 24 % 833,812 28 % Korea 347,947 21 % 181,948 12 % 537,465 17 % 379,398 13 % North America 214,808 13 % 158,517 11 % 384,984 12 % 340,500 12 % Japan 156,721 10 % 194,804 13 % 321,140 10 % 401,015 14 % Europe and Israel 100,201 6 % 97,466 6 % 183,318 6 % 156,849 5 % Rest of Asia 68,251 4 % 47,883 3 % 144,451 4 % 83,685 3 % Total $ 1,650,870 100 % $ 1,509,453 100 % $ 3,189,490 100 % $ 2,922,867 100 % The following is a summary of revenues by major products for the indicated periods: (Dollar amounts in thousands) Three Months Ended December 31, Six Months Ended December 31, 2020 2019 2020 2019 Revenues: Wafer Inspection $ 687,030 42 % $ 606,131 40 % $ 1,206,581 38 % $ 1,054,405 36 % Patterning 307,512 19 % 289,078 19 % 678,444 21 % 671,736 23 % Specialty Semiconductor Process 71,978 4 % 60,941 4 % 146,005 5 % 117,811 4 % PCB, Display and Component Inspection 115,825 7 % 129,235 9 % 236,451 7 % 249,595 9 % Services 412,847 25 % 364,903 24 % 805,972 25 % 720,342 24 % Other 55,678 3 % 59,165 4 % 116,037 4 % 108,978 4 % Total $ 1,650,870 100 % $ 1,509,453 100 % $ 3,189,490 100 % $ 2,922,867 100 % Wafer Inspection, and Patterning products are offered in Semiconductor Process Control segment. Services are offered in multiple segments. Other includes primarily refurbished systems, remanufactured legacy systems, and enhancements and upgrades for previous-generation products which are part of Semiconductor Process Control segment. In the three months ended December 31, 2020, two customers each accounted for approximately 14% of total revenues. In the three months ended December 31, 2019, two customers accounted for approximately 24% and 10% of total revenues. In the six months ended December 31, 2020, two customers accounted for approximately 14% and 13% of total revenues. In the six months ended December 31, 2019, two customers accounted for approximately 21% and 11% of total revenues. Two customers on an individual basis accounted for greater than 10% of net accounts receivable at December 31, 2020 and one customer on an individual basis accounted for greater than 10% of net accounts receivable at June 30, 2020. Land, property and equipment, net by geographic region as of the dates indicated below were as follows: As of As of (In thousands) December 31, 2020 June 30, 2020 Land, property and equipment, net: United States $ 391,080 $ 329,558 Israel 57,562 59,162 Singapore 68,027 54,946 Europe 55,979 58,065 Rest of Asia 21,537 18,093 Total $ 594,185 $ 519,824

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	6 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
RESTRUCTURING CHARGES	RESTRUCTURING CHARGES In September 2019, management approved a plan to streamline our organization and business processes that included the reduction of workforce, which is expected to be completed in the second half of our fiscal year 2021, primarily in our PCB, Display and Component Inspection segment. Restructuring charges were $4.6 million for the three months ended December 31, 2020, and included $1.0 million of non-cash charges for accelerated depreciation related to certain right-of use assets and fixed assets to be abandoned. Restructuring charges were $8.1 million for the six months ended December 31, 2020, and included $2.0 million of non-cash charges for accelerated depreciation related to certain right-of use assets and fixed assets to be abandoned. As of December 31, 2020, and June 30, 2020, the accrual for restructuring charges was $8.7 million and $5.7 million, respectively.

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	6 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation. For purposes of this report, “KLA,” the “Company,” “we,” “our,” “us,” or similar references mean KLA Corporation, and its majority-owned subsidiaries unless the context requires otherwise. The Condensed Consolidated Financial Statements have been prepared by us pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such rules and regulations. The unaudited interim Condensed Consolidated Financial Statements reflect all adjustments (consisting only of normal, recurring adjustments) necessary for a fair statement of the financial position, results of operations, comprehensive income, stockholders’ equity and cash flows for the periods indicated. These Condensed Consolidated Financial Statements and notes, however, should be read in conjunction with Item 8 “Financial Statements and Supplementary Data” included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020. The Condensed Consolidated Financial Statements include the accounts of KLA and its majority-owned subsidiaries. All significant intercompany balances and transactions have been eliminated. On February 20, 2019 ("Acquisition Date"), we completed the acquisition of Orbotech Ltd. ("Orbotech") hereinafter referred to as the "Orbotech Acquisition". The results of operations for the three and six months ended December 31, 2020 are not necessarily indicative of the results that may be expected for any other interim period or for the full fiscal year ending June 30, 2021. Certain reclassifications have been made to the prior year’s Condensed Consolidated Financial Statements to conform to the current year presentation. The reclassifications did not have material effects on the prior year’s Condensed Consolidated Balance Sheets, Statements of Operations, Comprehensive Income and Cash Flows.
Management Estimates	Management Estimates. The preparation of the Condensed Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions in applying our accounting policies that affect the reported amounts of assets and liabilities (and related disclosure of contingent assets and liabilities) at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
Credit Losses	Credit Losses Cash Equivalents and Marketable Securities . All highly liquid debt instruments with original or remaining maturities of less than three months at the date of purchase are cash equivalents. Marketable securities are generally classified as available-for-sale for use in current operations, if required, and are reported at fair value, with unrealized gains and non-credit related unrealized losses, net of tax, presented as a separate component of stockholders’ equity under the caption “Accumulated other comprehensive income (loss)” (“AOCI”). All realized gains and losses are recorded in earnings in the period of occurrence. The specific identification method is used to determine the realized gains and losses on investments. We regularly review the available-for-sale debt securities in an unrealized loss position, and evaluate the current expected credit loss by considering available information relevant to the collectibility of the security, such as historical experience, market data, issuer-specific factors including credit ratings, default and loss rates of the underlying collateral and structure and credit enhancements, current economic conditions and reasonable and supportable forecasts. If we do not expect to recover the entire amortized cost of the security, the amount representing credit losses, defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis of the debt security, is recorded as an allowance for credit losses with an offsetting entry to earnings; and the amount that is not credit-related is recognized in other comprehensive income (loss). If we have the intent to sell the security or it is more likely than not that we will be required to sell the security before recovery of its entire amortized cost basis, we first write off any previously recognized allowance for credit losses with an offsetting entry to the security’s amortized cost basis. If the allowance has been fully written off and fair value is less than amortized cost basis, we write down the amortized cost basis of the security to its fair value with an offsetting entry to net income. There were no credit losses on available-for-sale debt securities recognized for the three and six months ended December 31, 2020 and 2019. Allowance for Credit Losses . A majority of our accounts receivable are derived from sales to large multinational semiconductor and electronics manufacturers throughout the world. We maintain an allowance for credit losses for expected uncollectible accounts receivable, which is recorded as an offset to accounts receivable and changes in such are classified as selling, general and administrative expense in the Condensed Consolidated Statements of Income. We assess collectibility by reviewing accounts receivable on a collective basis where similar risk characteristics exist and on an individual basis when we identify specific customers with known disputes or collectibility issues. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. The allowance for credit losses is reviewed on a quarterly basis to assess the adequacy of the allowance. For the three and six months ended December 31, 2020, our assessment considered the impact of COVID-19 and estimates of expected credit and collectability trends. The credit losses recognized were not significant for the three and six months ended December 31, 2020 and 2019.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted As explained above, on July 1, 2020 we adopted ASC 326, which was issued by the Financial Accounting Board (“FASB”) in June 2016 as Accounting Standards Update ("ASU") No. 2016-13 Financial Instruments – Credit Losses (ASC 326): Measurement of Credit Losses on Financial Instruments . The ASU replaced previous incurred loss impairment guidance and established a single expected credit losses allowance framework for financial assets carried at amortized cost. It also eliminated the concept of other-than-temporary impairment and requires credit losses related to certain available-for-sale debt securities to be recorded through an allowance for credit losses. We adopted ASC 326 using the modified retrospective method, which requires a cumulative-effect adjustment to the opening balance of retained earnings to be recognized on the date of adoption and, accordingly, recorded a net decrease of $5.5 million to retained earnings as of July 1, 2020. Please see the “Credit Losses” accounting policy in the “Significant Accounting Policies” section above. In August 2018, the FASB issued an accounting standard update which modifies the existing accounting standards for the fair value measurement disclosure. This update eliminates the disclosures of the amount of and reasons for transfers between level 1 and level 2 of the fair value hierarchy, and the policy for the timing of transfers between levels. We adopted this update beginning in the first quarter of our fiscal year ending June 30, 2021 on a retrospective basis and the adoption had no material impact on our Condensed Consolidated Financial Statements. In August 2018, the FASB issued an accounting standard update to amend the disclosure requirements related to defined benefit pension and other post-retirement plans. Some of the changes include adding a disclosure requirement for significant gains and losses related to changes in the benefit obligation for the period and removing the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year. We adopted this update beginning in the first quarter of the fiscal year ending June 30, 2021 on a retrospective basis and the adoption had no material impact on our Condensed Consolidated Financial Statements. In August 2018, the FASB issued an accounting standard update to align the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The guidance clarifies which costs should be capitalized, including the cost to acquire the license and the related implementation costs. We adopted this update beginning in the first quarter of our fiscal year ending June 30, 2021 on a prospective basis, and the adoption had no material impact on our Condensed Consolidated Financial Statements. Updates Not Yet Effective In December 2019, the FASB issued an accounting standard update to simplify the accounting for income taxes in ASC 740, Income Taxes (“ASC 740”). This amendment removes certain exceptions and improves consistent application of accounting principles for certain areas in ASC 740. The update is effective for us beginning in the first quarter of our fiscal year ending June 30, 2022, and early adoption is permitted. We are currently evaluating the impact of this accounting standard update on our Consolidated Financial Statements.
Fair Value Measurements	Our financial assets and liabilities are measured and recorded at fair value, except for our debt and certain equity investments in privately-held companies. Equity investments without a readily available fair value are accounted for using the measurement alternative. The measurement alternative is calculated as cost minus impairment, if any, plus or minus changes resulting from observable price changes. Our non-financial assets, such as goodwill, intangible assets, and land, property and equipment, are assessed for impairment when an event or circumstance indicates that an other-than-temporary decline in value may have occurred.
Fair Value of Financial Instruments	Fair Value of Financial Instruments. We have evaluated the estimated fair value of financial instruments using available market information and valuations as provided by third-party sources. The use of different market assumptions and/or estimation methodologies could have a significant effect on the estimated fair value amounts. The fair value of our cash equivalents, accounts receivable, accounts payable and other current assets and liabilities approximate their carrying amounts due to the relatively short maturity of these items.

REVENUE (Tables)

REVENUE (Tables)	6 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Schedule of Contract Balances	The following table represents the opening and closing balances of accounts receivable, net, contract assets and contract liabilities as of the indicated dates. As of As of (In thousands, except for percentage) December 31, 2020 June 30, 2020 $ Change % Change Accounts receivable, net $ 1,219,189 $ 1,107,413 $ 111,776 10 % Contract assets $ 94,375 $ 99,876 $ (5,501) (6) % Contract liabilities $ 603,029 $ 666,055 $ (63,026) (9) %

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	6 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis	Financial assets (excluding cash held in operating accounts and time deposits) and liabilities measured at fair value on a recurring basis, as of the date indicated below, were presented on our Condensed Consolidated Balance Sheets as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Little or No Market Activity Inputs As of December 31, 2020 (In thousands) Total (Level 1) (Level 2) (Level 3) Assets Cash equivalents: Money market funds and other $ 795,712 $ 795,712 $ — $ — U.S. Treasury securities 15,400 — 15,400 — Marketable securities: Corporate debt securities 418,348 — 418,348 — Municipal securities 39,352 — 39,352 — Sovereign securities 3,059 — 3,059 — U.S. Government agency securities 146,096 146,096 — — U.S. Treasury securities 175,589 154,599 20,990 — Total cash equivalents and marketable securities (1) 1,593,556 1,096,407 497,149 — Other current assets: Derivative assets 2,660 — 2,660 — Other non-current assets: Executive Deferred Savings Plan 245,673 188,203 57,470 — Total financial assets (1) $ 1,841,889 $ 1,284,610 $ 557,279 $ — Liabilities Derivative liabilities $ (3,841) $ — $ (3,841) $ — Deferred payments (4,400) — — (4,400) Contingent consideration payable (7,214) — — (7,214) Total financial liabilities $ (15,455) $ — $ (3,841) $ (11,614) ________________ (1) Excludes cash of $542.7 million held in operating accounts and time deposits of $160.3 million as of December 31, 2020. Financial assets (excluding cash held in operating accounts and time deposits) and liabilities measured at fair value on a recurring basis, as of the date indicated below, were presented on our Condensed Consolidated Balance Sheets as follows: Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Little or No Market Activity Inputs As of June 30, 2020 (In thousands) Total (Level 1) (Level 2) (Level 3) Assets Cash equivalents: Money market funds and other $ 694,950 $ 694,950 $ — $ — Marketable securities: Corporate debt securities 381,957 — 381,957 — Municipal securities 29,110 — 29,110 — Sovereign securities 2,017 — 2,017 — U.S. Government agency securities 106,336 106,336 — — U.S. Treasury securities 181,193 151,210 29,983 — Total cash equivalents and marketable securities (1) 1,395,563 952,496 443,067 — Other current assets: Derivative assets 2,077 — 2,077 — Other non-current assets: Executive Deferred Savings Plan 213,487 166,000 47,487 — Total financial assets (1) $ 1,611,127 $ 1,118,496 $ 492,631 $ — Liabilities Derivative liabilities $ (1,410) $ — $ (1,410) $ — Deferred payments (6,750) — — (6,750) Contingent consideration payable (15,513) — — (15,513) Total financial liabilities $ (23,673) $ — $ (1,410) $ (22,263) ________________ (1) Excludes cash of $460.8 million held in operating accounts and time deposits of $78.7 million as of June 30, 2020.

FINANCIAL STATEMENT COMPONENTS

FINANCIAL STATEMENT COMPONENTS (Tables)	6 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Balance Sheet Components	Condensed Consolidated Balance Sheets As of As of (In thousands) December 31, 2020 June 30, 2020 Accounts receivable, net: Accounts receivable, gross $ 1,236,877 $ 1,119,235 Allowance for credit losses (17,688) (11,822) $ 1,219,189 $ 1,107,413 Inventories: Raw materials $ 525,002 $ 478,594 Customer service parts 355,908 338,608 Work-in-process 374,462 334,965 Finished goods 165,246 158,818 $ 1,420,618 $ 1,310,985 Other current assets: Contract assets $ 94,375 $ 99,876 Prepaid expenses 71,330 74,955 Deferred costs of revenue 58,793 77,219 Prepaid income and other taxes 37,744 56,809 Other current assets 24,375 15,816 $ 286,617 $ 324,675 Land, property and equipment, net: Land $ 67,867 $ 67,858 Buildings and leasehold improvements 436,180 405,238 Machinery and equipment 722,084 677,627 Office furniture and fixtures 32,429 29,964 Construction-in-process 126,656 93,736 1,385,216 1,274,423 Less: accumulated depreciation (791,031) (754,599) $ 594,185 $ 519,824 Other non-current assets: Executive Deferred Savings Plan (1) $ 245,673 $ 213,487 Operating lease right of use assets 103,430 100,790 Other non-current assets 54,380 48,702 $ 403,483 $ 362,979 Other current liabilities: Compensation and benefits $ 385,007 $ 251,379 Executive Deferred Savings Plan 245,976 215,167 Customer credits and advances 251,970 114,896 Other accrued expenses 156,916 183,435 Income taxes payable 116,091 35,640 Interest payable 36,176 36,265 Operating lease liabilities 31,220 28,994 $ 1,223,356 $ 865,776 Other non-current liabilities: Income taxes payable $ 362,164 $ 383,447 Pension liabilities 83,618 78,911 Operating lease liabilities 74,443 70,885 Other non-current liabilities 147,739 139,041 $ 667,964 $ 672,284 ________________ (1) We have a non-qualified deferred compensation plan (known as “Executive Deferred Savings Plan” or “EDSP”) under which certain employees and non-employee directors may defer a portion of their compensation. The expense associated with changes in the EDSP liability included in selling, general and administrative expense was $22.1 million and $12.0 million during the three months ended December 31, 2020 and 2019, respectively and was $35.3 million and $13.9 million during the six months ended December 31, 2020 and 2019, respectively. The amount of net gains associated with changes in the EDSP assets included in selling, general and administrative expense was $22.2 million and $11.9 million during the three months ended December 31, 2020 and 2019, respectively and was $35.5 million and $14.2 million during the six months ended December 31, 2020 and 2019, respectively. For additional details, refer to Note 1 “Description of Business and Summary of Significant Accounting Policies” of the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended June 30, 2020.
Schedule of Components of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income (loss) (“OCI”) as of the dates indicated below were as follows: (In thousands) Currency Translation Adjustments Unrealized Gains (Losses) on Available-for-Sale Securities Unrealized Gains (Losses) on Cash Flow Hedges Unrealized Gains (Losses) on Defined Benefit Plans Total Balance as of December 31, 2020 $ (30,806) $ 2,054 $ (24,204) $ (19,748) $ (72,704) Balance as of June 30, 2020 $ (43,957) $ 3,683 $ (23,250) $ (16,250) $ (79,774)
Schedule of Reclassification out of Accumulated Other Comprehensive Income	The effects on net income (loss) of amounts reclassified from accumulated OCI to the Condensed Consolidated Statements of Operations for the indicated period were as follows (in thousands): Three Months Ended Six Months Ended Location in the Condensed Consolidated December 31, December 31, Accumulated OCI Components Statements of Operations 2020 2019 2020 2019 Unrealized gains (losses) on cash flow hedges from foreign exchange and interest rate contracts Revenues $ (711) $ (8) $ (928) $ 365 Costs of revenues and operating expenses (125) (17) 425 (1,818) Interest expense (279) (100) (558) (199) Net gains (losses) reclassified from accumulated OCI $ (1,115) $ (125) $ (1,061) $ (1,652) Unrealized gains (losses) on available-for-sale securities Other expense (income), net $ (111) $ (82) $ (212) $ (86)

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	6 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	The amortized cost and fair value of marketable securities as of the dates indicated below were as follows: As of December 31, 2020 (In thousands) Amortized Gross Gross Fair Corporate debt securities $ 416,926 $ 1,445 $ (23) $ 418,348 Money market funds and other 795,712 — — 795,712 Municipal securities 39,190 165 (3) 39,352 Sovereign securities 3,056 3 — 3,059 U.S. Government agency securities 145,774 325 (3) 146,096 U.S. Treasury securities 190,282 708 (1) 190,989 Subtotal 1,590,940 2,646 (30) 1,593,556 Add: Time deposits (1) 160,301 — — 160,301 Less: Cash equivalents 888,792 1 — 888,793 Marketable securities $ 862,449 $ 2,645 $ (30) $ 865,064 As of June 30, 2020 (In thousands) Amortized Gross Gross Fair Corporate debt securities $ 379,334 $ 2,673 $ (50) $ 381,957 Money market funds and other 694,950 — — 694,950 Municipal securities 28,859 251 — 29,110 Sovereign securities 2,009 8 — 2,017 U.S. Government agency securities 106,091 252 (7) 106,336 U.S. Treasury securities 179,631 1,564 (2) 181,193 Subtotal 1,390,874 4,748 (59) 1,395,563 Add: Time deposits (1) 124,153 — — 124,153 Less: Cash equivalents 773,653 — — 773,653 Marketable securities $ 741,374 $ 4,748 $ (59) $ 746,063 ________________ (1) Time deposits excluded from fair value measurements.
Schedule of Investments with Gross Unrealized Losses	The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below, none of which were in a continuous loss position for 12 months or more: As of December 31, 2020 (In thousands) Fair Value Gross Corporate debt securities $ 47,474 $ (23) Municipal securities 6,478 (3) U.S. Government agency securities 6,504 (3) U.S. Treasury securities 29,252 (1) Total $ 89,708 $ (30) As of June 30, 2020 (In thousands) Fair Value Gross Corporate debt securities $ 44,429 $ (50) Municipal securities 870 — U.S. Government agency securities 9,951 (7) U.S. Treasury securities 19,010 (2) Total $ 74,260 $ (59)
Schedule of Contractual Maturities of Securities	The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Condensed Consolidated Balance Sheets, as of the date indicated below were as follows: As of December 31, 2020 (In thousands) Amortized Cost Fair Value Due within one year $ 468,753 $ 470,247 Due after one year through three years 393,696 394,817 $ 862,449 $ 865,064 As of June 30, 2020 (In thousands) Amortized Cost Fair Value Due within one year $ 415,915 $ 418,169 Due after one year through three years 325,459 327,894 $ 741,374 $ 746,063

GOODWILL AND PURCHASED INTANG_2

GOODWILL AND PURCHASED INTANGIBLE ASSETS (Tables)	6 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill Balances	The following table presents changes in goodwill carrying value during the six months ended December 31, 2020 (1) : (In thousands) Wafer Inspection and Patterning Global Service and Support ( “ GSS ” ) Specialty Semiconductor Process PCB and Display Component Inspection Total Balance as of June 30, 2020 $ 416,840 $ 25,908 $ 681,858 $ 907,221 $ 13,575 $ 2,045,402 Foreign currency adjustments 43 — — — — 43 Balance as of December 31, 2020 $ 416,883 $ 25,908 $ 681,858 $ 907,221 $ 13,575 $ 2,045,445 _________________
Schedule of Components of Purchased Intangible Assets	The components of purchased intangible assets as of the dates indicated below were as follows: As of As of (In thousands) December 31, 2020 June 30, 2020 Category Range of Useful Lives (in years) Gross Accumulated Net Gross Accumulated Net Existing technology 4-8 $ 1,373,458 $ 418,402 $ 955,056 $ 1,269,883 $ 342,623 $ 927,260 Customer relationships 4-9 305,817 115,070 190,747 305,817 98,754 207,063 Trade name / Trademark 4-7 117,383 46,355 71,028 117,383 39,216 78,167 Backlog and other <1-9 50,404 49,551 853 50,404 47,215 3,189 Intangible assets subject to amortization 1,847,062 629,378 1,217,684 1,743,487 527,808 1,215,679 In-process research and development 72,259 100 72,159 175,834 100 175,734 Total $ 1,919,321 $ 629,478 $ 1,289,843 $ 1,919,321 $ 527,908 $ 1,391,413
Schedule of Amortization Expense for Purchased Intangible Assets	Amortization expense for purchased intangible assets for the periods indicated below was as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Amortization expense - Cost of revenues $ 38,738 $ 36,364 $ 75,778 $ 71,985 Amortization expense - Selling, general and administrative 12,301 20,257 25,730 42,513 Amortization expense - Research and development 31 131 62 162 Total $ 51,070 $ 56,752 $ 101,570 $ 114,660
Schedule of Remaining Estimated Amortization Expense	Based on the purchased intangible assets gross carrying amount recorded as of December 31, 2020, the remaining estimated annual amortization expense is expected to be as follows: Fiscal year ending June 30: Amortization (In thousands) 2021 (remaining six months) $ 104,418 2022 208,186 2023 207,094 2024 204,577 2025 192,368 2026 and thereafter 301,041 Total $ 1,217,684

DEBT (Tables)

DEBT (Tables)	6 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Debt	The following table summarizes our debt as of December 31, 2020 and June 30, 2020: As of December 31, 2020 As of June 30, 2020 Amount Effective Amount Effective Fixed-rate 4.650% Senior Notes due on November 1, 2024 $ 1,250,000 4.682 % $ 1,250,000 4.682 % Fixed-rate 5.650% Senior Notes due on November 1, 2034 250,000 5.670 % 250,000 5.670 % Fixed-rate 4.100% Senior Notes due on March 15, 2029 800,000 4.159 % 800,000 4.159 % Fixed-rate 5.000% Senior Notes due on March 15, 2049 400,000 5.047 % 400,000 5.047 % Fixed-rate 3.300% Senior Notes due on March 1, 2050 750,000 3.302 % 750,000 3.302 % Revolving Credit Facility — — % 50,000 1.310 % Fixed-rate 3.47% Note Payable due on February 20, 2021 20,000 2.050 % — — % Fixed-rate 3.59% Note Payable due on February 20, 2022 20,000 2.300 % — — % Total 3,490,000 3,500,000 Unamortized discount/premium, net (7,421) (8,167) Unamortized debt issuance costs (21,114) (22,163) Total $ 3,461,465 $ 3,469,670 Reported as: Short-term debt $ 20,000 $ — Long-term debt 3,441,465 3,469,670 Total $ 3,461,465 $ 3,469,670

LEASES (Tables)

LEASES (Tables)	6 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Leases Cost	Supplemental cash flow information related to leases was as follows: Six Months Ended December 31, In thousands 2020 2019 Operating cash outflows from operating leases $ 19,253 $ 17,424 ROU assets obtained in exchange for new operating lease liabilities $ 20,584 $ 10,278
Schedule of Maturities of Lease Liabilities	Maturities of lease liabilities as of December 31, 2020 were as follows: Fiscal year ending June 30: Amount 2021 (remaining six months) $ 17,727 2022 28,811 2023 19,987 2024 13,358 2025 11,242 2026 and thereafter 19,823 Total lease payments 110,948 Less imputed interest (5,285) Total $ 105,663

EQUITY, LONG-TERM INCENTIVE C_2

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST (Tables)	6 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Combined Activity Under Equity Incentive Plans	The following table summarizes the combined activity under our equity incentive plans: (In thousands) Available For Grant (1) (2) Balance as of June 30, 2020 10,760 Restricted stock units granted (3) (619) Restricted stock units granted adjustment (4) 54 Restricted stock units canceled 88 Balance as of December 31, 2020 10,283 __________________ (1) The number of RSUs reflects the application of the award multiplier of 2.0x to calculate the impact of the award on the shares reserved under the 2004 Plan. (2) No additional stock options, RSUs or other awards will be granted under the Assumed Equity Plans. (3) Includes RSUs granted to senior management during the six months ended December 31, 2020 with performance-based vesting criteria (in addition to service-based vesting criteria for any of such RSUs that are deemed to have been earned) (“performance-based RSUs”). This line item includes all such performance-based RSUs granted during the six months ended December 31, 2020 reported at the maximum possible number of shares that may ultimately be issuable if all applicable performance-based criteria are achieved at their maximum levels and all applicable service-based criteria are fully satisfied (0.2 million shares for the six months ended December 31, 2020 reflects the application of the multiplier described above). (4) Represents the portion of RSUs granted with performance-based vesting criteria and reported at the actual number of shares issued upon achievement of the performance vesting criteria during the six months ended December 31, 2020.
Schedule of Stock-based Compensation Expense	The following table shows stock-based compensation expense for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Stock-based compensation expense by: Costs of revenues $ 4,104 $ 3,362 $ 7,771 $ 6,226 Research and development 5,225 5,073 10,696 10,360 Selling, general and administrative 17,498 18,354 35,352 37,147 Total stock-based compensation expense $ 26,827 $ 26,789 $ 53,819 $ 53,733
Schedule of Stock-based Compensation Capitalized as Inventory	The following table shows stock-based compensation capitalized as inventory as of the dates indicated below: As of As of (In thousands) December 31, 2020 June 30, 2020 Inventory $ 5,855 $ 6,752
Schedule of Restricted Stock Activity	The following table shows the activity and weighted-average grant date fair value for RSUs during the six months ended December 31, 2020: Shares (1) (In thousands) Weighted-Average Outstanding restricted stock units as of June 30, 2020 (2) 2,253 $ 107.33 Granted (3) 309 $ 202.60 Granted adjustments (27) $ 88.96 Vested and released (341) $ 98.54 Withheld for taxes (172) $ 98.54 Forfeited (51) $ 117.20 Outstanding restricted stock units as of December 31, 2020 (2) 1,971 $ 124.58 __________________ (1) Share numbers reflect actual shares subject to awarded RSUs. (2) Includes performance-based and market-based RSUs. (3) This line item includes performance-based RSUs granted during the six months ended December 31, 2020 reported at the maximum possible number of shares that may ultimately be issuable if all applicable performance-based criteria are achieved at their maximum levels and all applicable service-based criteria are fully satisfied (0.1 million shares for the six months ended December 31, 2020).
Schedule of Grant Date Fair Value, Weighted Average Grant Date Fair Value, and Tax Benefits for Restricted Stock Units	The following table shows the weighted-average grant date fair value per unit for the RSUs granted, vested, and tax benefits realized by us in connection with vested and released RSUs for the indicated periods : Three Months Ended Six Months Ended December 31, December 31, (In thousands, except for weighted-average grant date fair value) 2020 2019 2020 2019 Weighted-average grant date fair value per unit $ 220.53 $ 171.98 $ 202.60 $ 142.75 Grant date fair value of vested restricted stock units $ 23,267 $ 26,643 $ 50,569 $ 56,736 Tax benefits realized by us in connection with vested and released restricted stock units $ 6,694 $ 9,661 $ 13,431 $ 13,654
Schedule of Employee Stock Purchase Rights Valuation	The fair value of each purchase right under the ESPP was estimated on the date of grant using the Black-Scholes model and the straight-line attribution approach with the following weighted-average assumptions: Three Months Ended Six Months Ended December 31, December 31, 2020 2019 2020 2019 Stock purchase plan: Expected stock price volatility 51.9 % 31.6 % 51.9 % 31.6 % Risk-free interest rate 0.7 % 2.4 % 0.7 % 2.4 % Dividend yield 1.9 % 2.5 % 1.9 % 2.5 % Expected life (in years) 0.5 0.5 0.5 0.5
Schedule of Tax Benefits Realized and Weighted-average fair value for the ESPP	The following table shows total cash received from employees for the issuance of shares under the ESPP, the number of shares purchased by employees through the ESPP, the tax benefits realized by us in connection with the disqualifying dispositions of shares purchased under the ESPP and the weighted-average fair value per share for the indicated periods: Three Months Ended Six Months Ended (In thousands, except for weighted-average fair value per share) December 31, December 31, 2020 2019 2020 2019 Total cash received from employees for the issuance of shares under the ESPP $ 26,356 $ 24,492 $ 26,356 $ 24,492 Number of shares purchased by employees through the ESPP 161 237 161 237 Tax benefits realized by us in connection with the disqualifying dispositions of shares purchased under the ESPP $ (3,005) $ 119 $ 1,164 $ 1,853 Weighted-average fair value per share based on Black-Scholes model $ 52.23 $ 27.35 $ 52.23 $ 27.35

STOCK REPURCHASE PROGRAM (Table

STOCK REPURCHASE PROGRAM (Tables)	6 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule of Share Repurchases	Share repurchases for the indicated periods (based on the trade date of the applicable repurchase) were as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Number of shares of common stock repurchased 774 1,690 1,801 3,349 Total cost of repurchases $ 177,492 $ 280,593 $ 371,389 $ 509,089

NET INCOME PER SHARE (Tables)

NET INCOME PER SHARE (Tables)	6 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share	The following table sets forth the computation of basic and diluted net income per share attributable to KLA: Three Months Ended Six Months Ended (In thousands, except per share amounts) December 31, December 31, 2020 2019 2020 2019 Numerator: Net income attributable to KLA $ 457,251 $ 380,555 $ 877,818 $ 727,080 Denominator: Weighted-average shares - basic, excluding unvested restricted stock units 154,273 157,290 154,777 157,994 Effect of dilutive restricted stock units and options 1,287 1,330 1,280 1,320 Weighted-average shares - diluted 155,560 158,620 156,057 159,314 Basic net income per share attributable to KLA $ 2.96 $ 2.42 $ 5.67 $ 4.60 Diluted net income per share attributable to KLA $ 2.94 $ 2.40 $ 5.62 $ 4.56 Anti-dilutive securities excluded from the computation of diluted net income per share — 43 — 25

INCOME TAXES (Tables)

INCOME TAXES (Tables)	6 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Details of Income Taxes	The following table provides details of income taxes: Three Months Ended Six Months Ended December 31, December 31, (Dollar amounts in thousands) 2020 2019 2020 2019 Income before income taxes $ 527,402 $ 424,927 $ 1,011,208 $ 796,443 Provision for income taxes $ 70,419 $ 44,622 $ 134,083 $ 69,742 Effective tax rate 13.4 % 10.5 % 13.3 % 8.8 %

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	6 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Receivables Sold Under Factoring Agreements	The following table shows total receivables sold under factoring agreements and proceeds from sales of LCs for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Receivables sold under factoring agreements $ 49,917 $ 116,935 $ 138,562 $ 173,355 Proceeds from sales of LCs $ 21,709 $ 10,677 $ 40,839 $ 20,606

DERIVATIVE INSTRUMENTS AND HE_2

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	6 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments, Location, Designated and Non-Designated, Gains (Losses)	The gains (losses) on derivatives in cash flow hedging relationships recognized in OCI for the indicated periods were as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Derivatives Designated as Hedging Instruments: Foreign exchange contracts: Amounts included in the assessment of effectiveness $ (1,310) $ 2,305 $ (2,182) 1,565 Amounts excluded from the assessment of effectiveness $ (47) $ (15) $ (93) $ (17) The locations and amounts of designated and non-designated derivative’s gains and losses reported in the Condensed Consolidated Statements of Operations for the indicated periods were as follows: Three Months Ended December 31, Three Months Ended December 31, 2020 2019 (In thousands) Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Total amounts presented in the Condensed Consolidated Statements of Operations in which the effects of cash flow hedges are recorded $ 1,650,870 $ 1,080,706 $ 38,880 $ 3,882 $ 1,509,453 $ 1,046,622 $ 40,472 $ (2,568) Gains (losses) on Derivatives Designated as Hedging Instruments: Rate lock agreements: Amount of gains (losses) reclassified from accumulated OCI to earnings $ — $ — $ (279) $ — $ — $ — $ (100) $ — Foreign exchange contracts: Amount of gains (losses) reclassified from accumulated OCI to earnings $ (560) $ (125) $ — $ — $ 85 $ (17) $ — $ — Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach $ (151) $ — $ — $ — $ (93) $ — $ — $ — Gains (losses) on Derivatives Not Designated as Hedging Instruments: Amount of gains (losses) recognized in earnings $ — $ — $ — $ 2,661 $ — $ — $ — $ 2,056 Six Months Ended December 31, Six Months Ended December 31, 2020 2019 (In thousands) Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Revenue Cost of Revenues and Operating Expenses Interest Expense Other Expense (Income), Net Total amounts presented in the Condensed Consolidated Statement of Operations in which the effects of cash flow hedges are recorded $ 3,189,490 $ 2,092,937 $ 78,266 $ 7,079 $ 2,922,867 $ 2,049,788 $ 80,822 $ (4,186) Gains (losses) on Derivatives Designated as Hedging Instruments: Rate lock agreements: Amount of gains (losses) reclassified from accumulated OCI to earnings $ — $ — $ (558) $ — $ — $ — $ (199) $ — Foreign exchange contracts: Amount of gains (losses) reclassified from accumulated OCI to earnings $ (650) $ 425 $ — $ — $ 560 $ (1,818) $ — $ — Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach $ (278) $ — $ — $ — $ (195) $ — $ — $ — Gains (losses) on Derivatives Not Designated as Hedging Instruments: Amount of gains (losses) recognized in earnings $ — $ — $ — $ (2,937) $ — $ — $ — $ 4,381
Schedule of Notional Amounts of Derivatives Outstanding	The U.S. dollar equivalent of all outstanding notional amounts of foreign currency hedge contracts, with maximum remaining maturities of approximately thirteen months as of the dates indicated below were as follows: As of As of (In thousands) December 31, 2020 June 30, 2020 Cash flow hedge contracts - foreign currency Purchase $ 8,344 $ 10,705 Sell $ 95,706 $ 71,431 Other foreign currency hedge contracts Purchase $ 311,397 $ 329,310 Sell $ 321,076 $ 357,939
Schedule of Derivative Instruments, Fair Value	The locations and fair value of our derivatives reported in our Condensed Consolidated Balance Sheets as of the dates indicated below were as follows: Asset Derivatives Liability Derivatives Balance Sheet As of As of Balance Sheet As of As of Location December 31, 2020 June 30, 2020 Location December 31, 2020 June 30, 2020 (In thousands) Fair Value Fair Value Derivatives designated as hedging instruments Foreign exchange contracts Other current assets $ 311 $ 680 Other current liabilities $ 981 $ 45 Total derivatives designated as hedging instruments 311 680 981 45 Derivatives not designated as hedging instruments Foreign exchange contracts Other current assets 2,349 1,397 Other current liabilities 2,860 1,365 Total derivatives not designated as hedging instruments 2,349 1,397 2,860 1,365 Total derivatives $ 2,660 $ 2,077 $ 3,841 $ 1,410
Schedule of Balances and Changes in Accumulated Other Comprehensive Income Related to Derivative Instruments	The changes in OCI, before taxes, related to derivatives for the indicated periods were as follows: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Beginning balance $ (30,574) $ (10,006) $ (29,602) $ (10,791) Amount reclassified to earnings 1,115 125 1,061 1,652 Net change in unrealized gains or losses (1,357) 2,290 (2,275) 1,548 Ending balance $ (30,816) $ (7,591) $ (30,816) $ (7,591)
Schedule of Offsetting of Assets and Liabilities	The information related to the offsetting arrangements for the periods indicated was as follows (in thousands): As of December 31, 2020 Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets Description Gross Amounts of Derivatives Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets Net Amount of Derivatives Presented in the Condensed Consolidated Balance Sheets Financial Instruments Cash Collateral Received Net Amount Derivatives - Assets $ 2,660 $ — $ 2,660 $ (1,527) $ — $ 1,133 Derivatives - Liabilities $ (3,841) $ — $ (3,841) $ 1,527 $ — $ (2,314) As of June 30, 2020 Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets Description Gross Amounts of Derivatives Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets Net Amount of Derivatives Presented in the Condensed Consolidated Balance Sheets Financial Instruments Cash Collateral Received Net Amount Derivatives - Assets $ 2,077 $ — $ 2,077 $ (1,020) $ — $ 1,057 Derivatives - Liabilities $ (1,410) $ — $ (1,410) $ 1,020 $ — $ (390)

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	6 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table provides the transactions with these parties for the indicated periods (for the portion of such period that they were considered related): Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Total revenues $ 324 $ 2,794 $ 638 $ 3,835 Total purchases $ 279 $ 249 $ 571 $ 714

SEGMENT REPORTING AND GEOGRAP_2

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION (Tables)	6 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Summary of Results for Reportable Segments	The following is a summary of results for each of our four reportable segments for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Semiconductor Process Control: Revenues $ 1,380,184 $ 1,247,430 $ 2,648,138 $ 2,411,062 Segment gross margin 884,090 795,730 1,698,900 1,538,072 Specialty Semiconductor Process: Revenues 90,587 75,106 179,540 144,245 Segment gross margin 51,171 41,333 101,099 79,497 PCB, Display and Component Inspection: Revenues 179,267 186,279 360,444 364,831 Segment gross margin 84,584 82,538 174,753 158,606 Other: Revenues 449 517 590 2,748 Segment gross margin (121) 117 (108) 770 Totals: Revenues for reportable segments $ 1,650,487 $ 1,509,332 $ 3,188,712 $ 2,922,886 Segment gross margin $ 1,019,724 $ 919,718 $ 1,974,644 $ 1,776,945
Schedule of Reconciliation of Total Reportable Segments Revenue to Total Revenue	The following table reconciles total reportable segment revenues to total revenues for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Total revenues for reportable segments $ 1,650,487 $ 1,509,332 $ 3,188,712 $ 2,922,886 Corporate allocations and effects of foreign exchange rates 383 121 778 (19) Total revenues $ 1,650,870 $ 1,509,453 $ 3,189,490 $ 2,922,867
Schedule of Reconciliation of Total Segment Gross Margin to Total Income Before Income Taxes	The following table reconciles total segment gross margin to total income before income taxes for the indicated periods: Three Months Ended Six Months Ended December 31, December 31, (In thousands) 2020 2019 2020 2019 Total segment gross margin $ 1,019,724 $ 919,718 $ 1,974,644 $ 1,776,945 Acquisition-related charges, corporate allocations, and effects of foreign exchange rates (1) 38,587 43,883 75,449 91,937 Research and development 229,064 220,751 448,102 431,331 Selling, general and administrative 181,909 192,253 354,540 380,598 Interest expense 38,880 40,472 78,266 80,822 Other expense (income), net 3,882 (2,568) 7,079 (4,186) Income before income taxes $ 527,402 $ 424,927 $ 1,011,208 $ 796,443 __________________
Schedule of Revenues by Geographic Region	The following is a summary of revenues by geographic region, based on ship-to location, for the indicated periods: (Dollar amounts in thousands) Three Months Ended December 31, Six Months Ended December 31, 2020 2019 2020 2019 Revenues: China $ 382,157 23 % $ 381,752 25 % $ 868,246 27 % $ 727,608 25 % Taiwan 380,785 23 % 447,083 30 % 749,886 24 % 833,812 28 % Korea 347,947 21 % 181,948 12 % 537,465 17 % 379,398 13 % North America 214,808 13 % 158,517 11 % 384,984 12 % 340,500 12 % Japan 156,721 10 % 194,804 13 % 321,140 10 % 401,015 14 % Europe and Israel 100,201 6 % 97,466 6 % 183,318 6 % 156,849 5 % Rest of Asia 68,251 4 % 47,883 3 % 144,451 4 % 83,685 3 % Total $ 1,650,870 100 % $ 1,509,453 100 % $ 3,189,490 100 % $ 2,922,867 100 %
Schedule of Revenues by Major Products	The following is a summary of revenues by major products for the indicated periods: (Dollar amounts in thousands) Three Months Ended December 31, Six Months Ended December 31, 2020 2019 2020 2019 Revenues: Wafer Inspection $ 687,030 42 % $ 606,131 40 % $ 1,206,581 38 % $ 1,054,405 36 % Patterning 307,512 19 % 289,078 19 % 678,444 21 % 671,736 23 % Specialty Semiconductor Process 71,978 4 % 60,941 4 % 146,005 5 % 117,811 4 % PCB, Display and Component Inspection 115,825 7 % 129,235 9 % 236,451 7 % 249,595 9 % Services 412,847 25 % 364,903 24 % 805,972 25 % 720,342 24 % Other 55,678 3 % 59,165 4 % 116,037 4 % 108,978 4 % Total $ 1,650,870 100 % $ 1,509,453 100 % $ 3,189,490 100 % $ 2,922,867 100 %
Schedule of Long-Lived Assets by Geographic Region	Land, property and equipment, net by geographic region as of the dates indicated below were as follows: As of As of (In thousands) December 31, 2020 June 30, 2020 Land, property and equipment, net: United States $ 391,080 $ 329,558 Israel 57,562 59,162 Singapore 68,027 54,946 Europe 55,979 58,065 Rest of Asia 21,537 18,093 Total $ 594,185 $ 519,824

BASIS OF PRESENTATION (Details)

BASIS OF PRESENTATION (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Jul. 01, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Credit losses on available-for-sale debt securities recognized during the period	$ 0	$ 0	$ 0	$ 0
Net decrease of retained earnings	(2,950,306,000)	(2,687,970,000)	(2,950,306,000)	(2,687,970,000)	$ (2,762,345,000)		$ (2,681,010,000)	$ (2,679,619,000)	$ (2,677,693,000)
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Net decrease of retained earnings							5,530,000
Retained Earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Net decrease of retained earnings	$ (903,696,000)	$ (719,001,000)	$ (903,696,000)	$ (719,001,000)	$ (753,915,000)		(654,930,000)	$ (733,173,000)	$ (714,825,000)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Net decrease of retained earnings						$ 5,500,000	$ 5,530,000

REVENUE - Schedule of Contract

REVENUE - Schedule of Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2020	Jun. 30, 2020
Accounts receivable, net
Accounts receivable, net	$ 1,219,189	$ 1,107,413
Change in accounts receivable, net	$ 111,776
Percentage change in accounts receivable, net	10.00%
Contract assets
Contract assets	$ 94,375	99,876
Change in contract assets	$ (5,501)
Percentage change in contract assets	(6.00%)
Contract liabilities
Contract liabilities	$ 603,029	$ 666,055
Change in contract liabilities	$ (63,026)
Percentage change in contract liabilities	(9.00%)

REVENUE - Additional Informatio

REVENUE - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue remainder payable acceptance period	30 days
Decrease in contract assets, reclassified to accounts receivable		$ 54.5
Revenue recognized in excess of amount billed to customer		48.7
Revenue recognized, included in contract liabilities at beginning of period		$ 439.9
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue payment terms required payment percentage of total contract consideration within 30 To 60 days of shipment	70.00%	70.00%
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue payment terms required payment percentage of total contract consideration within 30 To 60 days of shipment	90.00%	90.00%

REVENUE - Remaining Performance

REVENUE - Remaining Performance Obligations (Details) $ in Millions	Dec. 31, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 2,570
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	12 months
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	5.00%
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	15.00%

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - USD ($)	Dec. 31, 2020	Jun. 30, 2020
Other current assets:
Derivative assets	$ 2,660,000	$ 2,077,000
Liabilities
Derivative liabilities	(3,841,000)	(1,410,000)
Contingent consideration payable	0
Cash excluded from fair value measurement	542,700,000	460,800,000
Time deposits excluded from fair value measurement	160,300,000	78,700,000
Recurring
Marketable securities:
Total cash equivalents and marketable securities	1,593,556,000	1,395,563,000
Other current assets:
Derivative assets	2,660,000	2,077,000
Other non-current assets:
Executive Deferred Savings Plan	245,673,000	213,487,000
Total financial assets	1,841,889,000	1,611,127,000
Liabilities
Derivative liabilities	(3,841,000)	(1,410,000)
Deferred payments	(4,400,000)	(6,750,000)
Contingent consideration payable	(7,214,000)	(15,513,000)
Total financial liabilities	(15,455,000)	(23,673,000)
Recurring | Money market funds and other
Cash equivalents:
Cash equivalents	795,712,000	694,950,000
Recurring | U.S. Treasury securities
Cash equivalents:
Cash equivalents	15,400,000
Marketable securities:
Marketable securities	175,589,000	181,193,000
Recurring | Corporate debt securities
Marketable securities:
Marketable securities	418,348,000	381,957,000
Recurring | Municipal securities
Marketable securities:
Marketable securities	39,352,000	29,110,000
Recurring | Sovereign securities
Marketable securities:
Marketable securities	3,059,000	2,017,000
Recurring | U.S. Government agency securities
Marketable securities:
Marketable securities	146,096,000	106,336,000
Recurring | Level 1
Marketable securities:
Total cash equivalents and marketable securities	1,096,407,000	952,496,000
Other current assets:
Derivative assets	0	0
Other non-current assets:
Executive Deferred Savings Plan	188,203,000	166,000,000
Total financial assets	1,284,610,000	1,118,496,000
Liabilities
Derivative liabilities	0	0
Deferred payments	0	0
Contingent consideration payable	0	0
Total financial liabilities	0	0
Recurring | Level 1 | Money market funds and other
Cash equivalents:
Cash equivalents	795,712,000	694,950,000
Recurring | Level 1 | U.S. Treasury securities
Cash equivalents:
Cash equivalents	0
Marketable securities:
Marketable securities	154,599,000	151,210,000
Recurring | Level 1 | Corporate debt securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 1 | Municipal securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 1 | Sovereign securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 1 | U.S. Government agency securities
Marketable securities:
Marketable securities	146,096,000	106,336,000
Recurring | Level 2
Marketable securities:
Total cash equivalents and marketable securities	497,149,000	443,067,000
Other current assets:
Derivative assets	2,660,000	2,077,000
Other non-current assets:
Executive Deferred Savings Plan	57,470,000	47,487,000
Total financial assets	557,279,000	492,631,000
Liabilities
Derivative liabilities	(3,841,000)	(1,410,000)
Deferred payments	0	0
Contingent consideration payable	0	0
Total financial liabilities	(3,841,000)	(1,410,000)
Recurring | Level 2 | Money market funds and other
Cash equivalents:
Cash equivalents	0	0
Recurring | Level 2 | U.S. Treasury securities
Cash equivalents:
Cash equivalents	15,400,000
Marketable securities:
Marketable securities	20,990,000	29,983,000
Recurring | Level 2 | Corporate debt securities
Marketable securities:
Marketable securities	418,348,000	381,957,000
Recurring | Level 2 | Municipal securities
Marketable securities:
Marketable securities	39,352,000	29,110,000
Recurring | Level 2 | Sovereign securities
Marketable securities:
Marketable securities	3,059,000	2,017,000
Recurring | Level 2 | U.S. Government agency securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 3
Marketable securities:
Total cash equivalents and marketable securities	0	0
Other current assets:
Derivative assets	0	0
Other non-current assets:
Executive Deferred Savings Plan	0	0
Total financial assets	0	0
Liabilities
Derivative liabilities	0	0
Deferred payments	(4,400,000)	(6,750,000)
Contingent consideration payable	(7,214,000)	(15,513,000)
Total financial liabilities	(11,614,000)	(22,263,000)
Recurring | Level 3 | Money market funds and other
Cash equivalents:
Cash equivalents	0	0
Recurring | Level 3 | U.S. Treasury securities
Cash equivalents:
Cash equivalents	0
Marketable securities:
Marketable securities	0	0
Recurring | Level 3 | Corporate debt securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 3 | Municipal securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 3 | Sovereign securities
Marketable securities:
Marketable securities	0	0
Recurring | Level 3 | U.S. Government agency securities
Marketable securities:
Marketable securities	$ 0	$ 0

FINANCIAL STATEMENT COMPONENT_2

FINANCIAL STATEMENT COMPONENTS - Balance Sheet Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Accounts receivable, net:
Accounts receivable, gross	$ 1,236,877		$ 1,236,877		$ 1,119,235
Allowance for credit losses	(17,688)		(17,688)		(11,822)
Accounts receivable, net	1,219,189		1,219,189		1,107,413
Inventories:
Raw materials	525,002		525,002		478,594
Customer service parts	355,908		355,908		338,608
Work-in-process	374,462		374,462		334,965
Finished goods	165,246		165,246		158,818
Inventories	1,420,618		1,420,618		1,310,985
Other current assets:
Contract assets	94,375		94,375		99,876
Prepaid expenses	71,330		71,330		74,955
Deferred costs of revenue	58,793		58,793		77,219
Prepaid income and other taxes	37,744		37,744		56,809
Other current assets	24,375		24,375		15,816
Other current assets, total	286,617		286,617		324,675
Land, property and equipment, net:
Land	67,867		67,867		67,858
Buildings and leasehold improvements	436,180		436,180		405,238
Machinery and equipment	722,084		722,084		677,627
Office furniture and fixtures	32,429		32,429		29,964
Construction-in-process	126,656		126,656		93,736
Land, property and equipment, gross	1,385,216		1,385,216		1,274,423
Less: accumulated depreciation	(791,031)		(791,031)		(754,599)
Land, property and equipment, net	594,185		594,185		519,824
Other non-current assets:
Executive Deferred Savings Plan	245,673		245,673		213,487
Operating lease right of use assets	103,430		103,430		100,790
Other non-current assets	54,380		54,380		48,702
Other non-current assets, total	403,483		403,483		362,979
Other current liabilities:
Compensation and benefits	385,007		385,007		251,379
Executive Deferred Savings Plan	245,976		245,976		215,167
Customer credits and advances	251,970		251,970		114,896
Other accrued expenses	156,916		156,916		183,435
Income taxes payable	116,091		116,091		35,640
Interest payable	36,176		36,176		36,265
Operating lease liabilities	31,220		31,220		28,994
Other current liabilities, total	1,223,356		1,223,356		865,776
Other non-current liabilities:
Income taxes payable	362,164		362,164		383,447
Pension liabilities	83,618		83,618		78,911
Operating lease liabilities	74,443		74,443		70,885
Other non-current liabilities	147,739		147,739		139,041
Other non-current liabilities, total	667,964		667,964		$ 672,284
Selling, general and administrative
Other non-current liabilities:
Expense associated with changes in the EDSP Liability	22,100	$ 12,000	35,300	$ 13,900
Gain on deferred compensation plan assets	$ 22,200	$ 11,900	$ 35,500	$ 14,200

FINANCIAL STATEMENT COMPONENT_3

FINANCIAL STATEMENT COMPONENTS - Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 2,665,424
Ending balance	2,935,182
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(43,957)
Ending balance	(30,806)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss)
Beginning balance	3,683
Ending balance	2,054
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(23,250)
Ending balance	(24,204)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(16,250)
Ending balance	(19,748)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(79,774)
Ending balance	$ (72,704)

FINANCIAL STATEMENT COMPONENT_4

FINANCIAL STATEMENT COMPONENTS - Effects on Net Income (Loss) of Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss)
Revenues	$ 1,650,870		$ 1,509,453		$ 3,189,490	$ 2,922,867
Costs of revenues and operating expenses	(1,080,706)		(1,046,622)		(2,092,937)	(2,049,788)
Interest expense	(38,880)		(40,472)		(78,266)	(80,822)
Net gains (losses) reclassified from accumulated OCI	457,251	$ 420,567	380,555	$ 346,525	877,818	727,080
Other expense (income), net	3,882		(2,568)		7,079	(4,186)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Reclassification adjustment from AOCI, net of tax	300		200		500	500
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on cash flow hedges from foreign exchange and interest rate contracts
Accumulated Other Comprehensive Income (Loss)
Revenues	(711)		(8)		(928)	365
Costs of revenues and operating expenses	(125)		(17)		425	(1,818)
Interest expense	(279)		(100)		(558)	(199)
Net gains (losses) reclassified from accumulated OCI	(1,115)		(125)		(1,061)	(1,652)
Reclassification out of accumulated other comprehensive income | Unrealized gains (losses) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Other expense (income), net	$ (111)		$ (82)		$ (212)	$ (86)

MARKETABLE SECURITIES - Amortiz

MARKETABLE SECURITIES - Amortized Cost and Fair Value (Details)	Dec. 31, 2020USD ($)investment	Jun. 30, 2020USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,590,940,000	$ 1,390,874,000
Gross Unrealized Gains	2,646,000	4,748,000
Gross Unrealized Losses	(30,000)	(59,000)
Fair Value	1,593,556,000	1,395,563,000
Add: Time deposits	160,301,000	124,153,000
Marketable securities, Amortized Cost	862,449,000	741,374,000
Marketable securities, Gross Unrealized Gains	2,645,000	4,748,000
Marketable securities, Gross Unrealized Losses	(30,000)	(59,000)
Marketable securities, Fair value	$ 865,064,000	746,063,000
Number of investments in an unrealized loss position | investment	39
Investments in continuous loss position, 12 months or more	$ 0
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	888,792,000	773,653,000
Gross Unrealized Gains	1,000	0
Gross Unrealized Losses	0	0
Fair Value	888,793,000	773,653,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	416,926,000	379,334,000
Gross Unrealized Gains	1,445,000	2,673,000
Gross Unrealized Losses	(23,000)
Fair Value	418,348,000	381,957,000
Money market funds and other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	795,712,000	694,950,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	795,712,000	694,950,000
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,190,000	28,859,000
Gross Unrealized Gains	165,000	251,000
Gross Unrealized Losses	(3,000)
Fair Value	39,352,000	29,110,000
Sovereign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,056,000	2,009,000
Gross Unrealized Gains	3,000	8,000
Gross Unrealized Losses	0	0
Fair Value	3,059,000	2,017,000
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	145,774,000	106,091,000
Gross Unrealized Gains	325,000	252,000
Gross Unrealized Losses	(3,000)
Fair Value	146,096,000	106,336,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	190,282,000	179,631,000
Gross Unrealized Gains	708,000	1,564,000
Gross Unrealized Losses	(1,000)
Fair Value	$ 190,989,000	$ 181,193,000
Corporate and Government securities
Debt Securities, Available-for-sale [Line Items]
Investment portfolio, maximum maturity term	3 years

MARKETABLE SECURITIES - Continu

MARKETABLE SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 89,708	$ 74,260
Gross Unrealized Losses	(30)	(59)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	47,474	44,429
Gross Unrealized Losses	(23)	(50)
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	6,478	870
Gross Unrealized Losses	(3)	0
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	6,504	9,951
Gross Unrealized Losses	(3)	(7)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	29,252	19,010
Gross Unrealized Losses	$ (1)	$ (2)

MARKETABLE SECURITIES - Contrac

MARKETABLE SECURITIES - Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Amortized Cost
Due within one year	$ 468,753	$ 415,915
Due after one year through three years	393,696	325,459
Marketable securities, Amortized Cost	862,449	741,374
Fair Value
Due within one year	470,247	418,169
Due after one year through three years	394,817	327,894
Marketable securities, Fair Value	$ 865,064	$ 746,063

BUSINESS COMBINATIONS (Details)

BUSINESS COMBINATIONS (Details) - USD ($)	Apr. 24, 2020	Aug. 22, 2019	Dec. 31, 2020
Business Acquisition
Estimated additional consideration			$ 0
April 2020 acquisition
Business Acquisition
Total purchase consideration	$ 11,400,000
Acquired goodwill	$ 2,200,000
August 2019 acquisition
Business Acquisition
Total purchase consideration		$ 94,000,000
Additional consideration (up to)		$ 60,000,000
August 2019 acquisition | Wafer Inspection and Patterning
Business Acquisition
Acquired goodwill			54,200,000
Other Acquisitions
Business Acquisition
Contingent consideration liability, non-current			$ 7,200,000

GOODWILL AND PURCHASED INTANG_3

GOODWILL AND PURCHASED INTANGIBLE ASSETS - Schedule of Goodwill (Details)	6 Months Ended
	Dec. 31, 2020USD ($)
Goodwill
Beginning balance	$ 2,045,402,000
Foreign currency adjustments	43,000
Ending balance	2,045,445,000
Wafer Inspection and Patterning
Goodwill
Beginning balance	416,840,000
Foreign currency adjustments	43,000
Ending balance	416,883,000
Global Service and Support (“GSS”)
Goodwill
Beginning balance	25,908,000
Foreign currency adjustments	0
Ending balance	25,908,000
Specialty Semiconductor Process
Goodwill
Beginning balance	681,858,000
Foreign currency adjustments	0
Ending balance	681,858,000
PCB and Display
Goodwill
Beginning balance	907,221,000
Foreign currency adjustments	0
Ending balance	907,221,000
Component Inspection
Goodwill
Beginning balance	13,575,000
Foreign currency adjustments	0
Ending balance	13,575,000
Others
Goodwill
Beginning balance	0
Ending balance	$ 0

GOODWILL AND PURCHASED INTANG_4

GOODWILL AND PURCHASED INTANGIBLE ASSETS - Additional Information (Details)	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2020USD ($)	Dec. 31, 2020segmentreporting_unit	Mar. 31, 2020USD ($)
Goodwill [Line Items]
Number of reportable segments | segment		4
Number of reporting units | reporting_unit		6
Impairment of intangible assets			$ 0
Specialty Semiconductor Process
Goodwill [Line Items]
Goodwill impairment	$ 144,200,000
PCB and Display
Goodwill [Line Items]
Goodwill impairment	$ 112,500,000

GOODWILL AND PURCHASED INTANG_5

GOODWILL AND PURCHASED INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2020	Jun. 30, 2020
Purchased Intangible Assets
Gross Carrying Amount	$ 1,847,062	$ 1,743,487
Accumulated Amortization and Impairment	629,378	527,808
Total	1,217,684	1,215,679
Intangible assets, gross	1,919,321	1,919,321
Finite-lived intangible assets, accumulated amortization and other accumulated adjustments	629,478	527,908
Net Amount	1,289,843	1,391,413
In-process research and development
Purchased Intangible Assets
Indefinite-lived intangible assets	72,259	175,834
Finite-lived intangible assets, accumulated amortization and other accumulated adjustments	100	100
Indefinite-lived intangible assets, net of other accumulated adjustments	72,159	175,734
Existing technology
Purchased Intangible Assets
Gross Carrying Amount	1,373,458	1,269,883
Accumulated Amortization and Impairment	418,402	342,623
Total	955,056	927,260
Customer relationships
Purchased Intangible Assets
Gross Carrying Amount	305,817	305,817
Accumulated Amortization and Impairment	115,070	98,754
Total	190,747	207,063
Trade name / Trademark
Purchased Intangible Assets
Gross Carrying Amount	117,383	117,383
Accumulated Amortization and Impairment	46,355	39,216
Total	71,028	78,167
Backlog and other
Purchased Intangible Assets
Gross Carrying Amount	50,404	50,404
Accumulated Amortization and Impairment	49,551	47,215
Total	$ 853	$ 3,189
Minimum | Existing technology
Purchased Intangible Assets
Range of Useful  Lives (in years)	4 years
Minimum | Customer relationships
Purchased Intangible Assets
Range of Useful  Lives (in years)	4 years
Minimum | Trade name / Trademark
Purchased Intangible Assets
Range of Useful  Lives (in years)	4 years
Minimum | Backlog and other
Purchased Intangible Assets
Range of Useful  Lives (in years)	1 year
Maximum | Existing technology
Purchased Intangible Assets
Range of Useful  Lives (in years)	8 years
Maximum | Customer relationships
Purchased Intangible Assets
Range of Useful  Lives (in years)	9 years
Maximum | Trade name / Trademark
Purchased Intangible Assets
Range of Useful  Lives (in years)	7 years
Maximum | Backlog and other
Purchased Intangible Assets
Range of Useful  Lives (in years)	9 years

GOODWILL AND PURCHASED INTANG_6

GOODWILL AND PURCHASED INTANGIBLE ASSETS - Amortization Expense for Purchased Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Purchased Intangible Assets
Amortization of intangible assets	$ 51,070	$ 56,752	$ 101,570	$ 114,660
Costs of revenues
Purchased Intangible Assets
Amortization of intangible assets	38,738	36,364	75,778	71,985
Selling, general and administrative
Purchased Intangible Assets
Amortization of intangible assets	12,301	20,257	25,730	42,513
Research and development
Purchased Intangible Assets
Amortization of intangible assets	$ 31	$ 131	$ 62	$ 162

GOODWILL AND PURCHASED INTANG_7

GOODWILL AND PURCHASED INTANGIBLE ASSETS - Future Estimated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Remaing Estimated Amortization Expense
2021 (remaining six months)	$ 104,418
2022	208,186
2023	207,094
2024	204,577
2025	192,368
2026 and thereafter	301,041
Total	$ 1,217,684	$ 1,215,679

DEBT - Schedule of Debt (Detail

DEBT - Schedule of Debt (Details) - USD ($)	Dec. 31, 2020	Jun. 30, 2020
Debt Instrument
Debt outstanding	$ 3,490,000,000	$ 3,500,000,000
Unamortized discount/premium, net	(7,421,000)	(8,167,000)
Unamortized debt issuance costs	(21,114,000)	(22,163,000)
Total, net of discount	3,461,465,000	3,469,670,000
Short-term debt	20,000,000	0
Long-term debt	3,441,465,000	3,469,670,000
Revolving credit facility | Line of credit
Debt Instrument
Debt outstanding	$ 0	$ 50,000,000
Effective interest rate	0.00%	1.31%
Fixed-rate 4.650% Senior Notes due on November 1, 2024 | Senior notes
Debt Instrument
Stated interest rate	4.65%
Debt outstanding	$ 1,250,000,000	$ 1,250,000,000
Effective interest rate	4.682%	4.682%
Fixed-rate 5.650% Senior Notes due on November 1, 2034 | Senior notes
Debt Instrument
Stated interest rate	5.65%
Debt outstanding	$ 250,000,000	$ 250,000,000
Effective interest rate	5.67%	5.67%
Fixed-rate 4.100% Senior Notes due on March 15, 2029 | Senior notes
Debt Instrument
Stated interest rate	4.10%
Debt outstanding	$ 800,000,000	$ 800,000,000
Effective interest rate	4.159%	4.159%
Fixed-rate 5.000% Senior Notes due on March 15, 2049 | Senior notes
Debt Instrument
Stated interest rate	5.00%
Debt outstanding	$ 400,000,000	$ 400,000,000
Effective interest rate	5.047%	5.047%
Fixed-rate 3.300% Senior Notes due on March 1, 2050 | Senior notes
Debt Instrument
Stated interest rate	3.30%
Debt outstanding	$ 750,000,000	$ 750,000,000
Effective interest rate	3.302%	3.302%
Fixed-rate 3.47% Note Payable due on February 20, 2021 | Notes Payable
Debt Instrument
Stated interest rate	3.47%
Debt outstanding	$ 20,000,000	$ 0
Effective interest rate	2.05%	0.00%
Fixed-rate 3.59% Note Payable due on February 20, 2022 | Notes Payable
Debt Instrument
Stated interest rate	3.59%
Debt outstanding	$ 20,000,000	$ 0
Effective interest rate	2.30%	0.00%

DEBT - Future Principal Payment

DEBT - Future Principal Payments (Details) $ in Millions	Dec. 31, 2020USD ($)
Debt Disclosure [Abstract]
Due in the third quarter of fiscal 2021	$ 20
Due in 2022	20
Due in 2025	1,250
Due after fiscal year 2026	$ 2,200

DEBT - Senior Notes and Debt Re

DEBT - Senior Notes and Debt Redemption (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Feb. 29, 2020	Mar. 31, 2019	Nov. 30, 2014
Debt Instrument
Repayment of debt				$ 50,000,000	$ 275,000,000
Debt outstanding				$ 3,490,000,000		$ 3,500,000,000
Senior notes
Debt Instrument
Redemption price				101.00%
Fair value disclosure				$ 4,140,000,000		$ 4,010,000,000
Senior notes | 2020 Senior Notes
Debt Instrument
Debt face amount							$ 750,000,000
Senior notes | 2019 Senior Notes
Debt Instrument
Debt face amount								$ 1,200,000,000
Senior notes | 2014 Senior Notes
Debt Instrument
Debt face amount									$ 2,500,000,000
Repayment of debt	$ 500,000,000	$ 250,000,000	$ 250,000,000
Debt outstanding				$ 1,500,000,000

DEBT - Revolving Credit Facilit

DEBT - Revolving Credit Facility (Details)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2017quarter	Sep. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jun. 30, 2020USD ($)
Debt Instrument
Proceeds from revolving credit facility				$ 0	$ 250,000,000
Repayment of debt				50,000,000	$ 275,000,000
Debt outstanding				3,490,000,000		$ 3,500,000,000
Line of credit | Revolving credit facility
Debt Instrument
Maximum borrowing capacity				1,000,000,000
Proceeds from revolving credit facility						450,000,000
Repayment of debt			$ 200,000,000			400,000,000
Debt outstanding				$ 0		$ 50,000,000
Repayments of lines of credit		$ 50,000,000
Commitment fee percentage (in bps)				0.125%
Covenant compliance, number of consecutive quarters | quarter	4
Covenant compliance, minimum interest expense coverage ratio	3.50
Maximum leverage ratio	3			3.50
Maximum leverage ratio under a material acquisition or series of material acquisitions	4
Line of credit | Revolving credit facility | Minimum
Debt Instrument
Commitment fee percentage (in bps)	0.10%
Line of credit | Revolving credit facility | Maximum
Debt Instrument
Commitment fee percentage (in bps)	0.25%
Line of credit | Revolving credit facility | Alternative base rate | Minimum
Debt Instrument
Basis spread on variable rate (in bps)	0.00%
Line of credit | Revolving credit facility | Alternative base rate | Maximum
Debt Instrument
Basis spread on variable rate (in bps)	0.75%
Line of credit | Revolving credit facility | LIBOR
Debt Instrument
Basis spread on variable rate (in bps)	1.125%
Line of credit | Revolving credit facility | LIBOR | Minimum
Debt Instrument
Basis spread on variable rate (in bps)	1.00%
Line of credit | Revolving credit facility | LIBOR | Maximum
Debt Instrument
Basis spread on variable rate (in bps)	1.75%

DEBT - Notes Payable (Details)

DEBT - Notes Payable (Details) - Notes Payable	Dec. 31, 2020USD ($)
Debt Instrument
Debt face amount	$ 40,000,000
Debt instrument premium	300,000
Fixed-rate 3.47% Note Payable due on February 20, 2021
Debt Instrument
Debt face amount	20,000,000
Fixed-rate 3.59% Note Payable due on February 20, 2022
Debt Instrument
Debt face amount	$ 20,000,000

LEASES - Additional Information

LEASES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Operating Leased Assets [Line Items]
Total lease expense	$ 10	$ 9.1	$ 19.6	$ 17.6
Operating leases, weighted average remaining lease term	4 years 9 months 18 days		4 years 9 months 18 days		5 years 1 month 6 days
Operating leases, weighted average discount rate	1.80%		1.80%		1.99%
Minimum
Operating Leased Assets [Line Items]
Remaining lease terms			1 year
Maximum
Operating Leased Assets [Line Items]
Remaining lease terms			16 years

LEASES - Supplemental Cash Flow

LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash outflows from operating leases	$ 19,253	$ 17,424
ROU assets obtained in exchange for new operating lease liabilities	$ 20,584	$ 10,278

LEASES - Maturities of Lease Li

LEASES - Maturities of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2020USD ($)
Operating Leases, After Adoption of 842
2021 (remaining six months)	$ 17,727
2022	28,811
2023	19,987
2024	13,358
2025	11,242
2026	19,823
Total lease payments	110,948
Less imputed interest	(5,285)
Total	$ 105,663

EQUITY, LONG-TERM INCENTIVE C_3

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Equity Incentive Program and Assumed Equity Plans (Details) - shares	Dec. 31, 2020	Jun. 30, 2020
2004 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)	10,283,000	10,760,000
Assumed Equity Plans
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)	89,963

EQUITY, LONG-TERM INCENTIVE C_4

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Equity Incentive Plans General Information (Details) shares in Thousands	6 Months Ended
	Dec. 31, 2020shares	Dec. 31, 2020shares
Restricted stock unit, Performance-based and Service-based | Senior Management
Total Shares Available for Grant under the Company's equity incentive plans:
Ending balance (in shares)	200
Number of shares available for grant (in shares)	200	200
2004 Plan
Total Shares Available for Grant under the Company's equity incentive plans:
Beginning balance (in shares)	10,760
Restricted stock units granted (in shares)	(619)
Restricted stock units granted adjustment (in shares)	54
Restricted stock units canceled (in shares)	88
Ending balance (in shares)	10,283
Impact on share reserve multiplier		2
Number of shares available for grant (in shares)	10,283	10,283
2004 Plan | Restricted stock unit, Performance-based and Service-based
Total Shares Available for Grant under the Company's equity incentive plans:
Ending balance (in shares)	100
Number of shares available for grant (in shares)	100	100

EQUITY, LONG-TERM INCENTIVE C_5

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Stock-based compensation expense
Stock-based compensation expense	$ 26,827	$ 26,789	$ 53,819	$ 53,733
Stock-based compensation capitalized as inventory	5,855		5,855		$ 6,752
Costs of revenues
Stock-based compensation expense
Stock-based compensation expense	4,104	3,362	7,771	6,226
Research and development
Stock-based compensation expense
Stock-based compensation expense	5,225	5,073	10,696	10,360
Selling, general and administrative
Stock-based compensation expense
Stock-based compensation expense	$ 17,498	$ 18,354	$ 35,352	$ 37,147

EQUITY, LONG-TERM INCENTIVE C_6

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Restricted Stock Unit Activities (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019$ / shares	Dec. 31, 2020USD ($)Installment$ / sharesshares	Dec. 31, 2019$ / shares	Jun. 30, 2020shares
Restricted stock units
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Restricted stock units granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 220.53	$ 171.98	$ 202.60	$ 142.75
Unrecognized stock-based compensation balance | $	$ 165		$ 165
Estimated weighted-average amortization period			1 year 7 months 6 days
Intrinsic value | $	$ 510.3		$ 510.3
Restricted stock unit, Service-based | Minimum
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Share-based vesting period			2 years
Restricted stock unit, Service-based | Maximum
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Share-based vesting period			4 years
Restricted stock unit, Performance-based and Service-based
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Service and performance-based, number of equal vesting installments | Installment			2
Restricted Stock Unit, Market-based and Service-based
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Service and performance-based, number of equal vesting installments | Installment			3
2004 Plan
Restricted Stock Units Activity Rollforward
Granted (in shares)			619
Granted adjustments (in shares)			54
Forfeited (in shares)			(88)
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Number of shares available for grant (in shares)	10,283		10,283		10,760
2004 Plan | Restricted stock units
Restricted Stock Units Activity Rollforward
Outstanding restricted stock units, beginning (in shares)			2,253
Granted (in shares)			309
Granted adjustments (in shares)			(27)
Vested and released (in shares)			(341)
Withheld for taxes (in shares)			(172)
Forfeited (in shares)			(51)
Outstanding restricted stock units, ending (in shares)	1,971		1,971
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Outstanding restricted stock units as of June 30, 2020, weighted-average grant date fair value (in dollars per share) | $ / shares			$ 107.33
Restricted stock units granted, weighted-average grant date fair value (in dollars per share) | $ / shares			202.60
Restricted stock units granted adjustments, weighted-average grant date fair value (in dollars per share) | $ / shares			88.96
Restricted stock units vested and released, weighted-average grant date fair value (in dollars per share) | $ / shares			98.54
Restricted stock units withheld for taxes, weighted-average grant date fair value (in dollars per share) | $ / shares			98.54
Restricted stock units forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares			117.20
Outstanding restricted stock units as of September 30, 2020, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 124.58		$ 124.58
2004 Plan | Restricted stock unit, Performance-based and Service-based
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value Rollforward
Number of shares available for grant (in shares)	100		100

EQUITY, LONG-TERM INCENTIVE C_7

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Weighted-Average Grant Date Fair Value (Details) - Restricted stock units - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average grant date fair value per unit (in dollars per share)	$ 220.53	$ 171.98	$ 202.60	$ 142.75
Grant date fair value of vested restricted stock units	$ 23,267	$ 26,643	$ 50,569	$ 56,736
Tax benefits realized by us in connection with vested and released restricted stock units	$ 6,694	$ 9,661	$ 13,431	$ 13,654

EQUITY, LONG-TERM INCENTIVE C_8

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Cash-Based Long-Term Incentive Compensation (Details) - Cash long-term incentive plan $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)Installment	Dec. 31, 2019USD ($)
Cash Long-Term Incentive Plan
Cash-based long-term incentive plan, authorized amount			$ 4.1	$ 4.3
Cash long-term incentive plan, compensation expense	$ 17.3	$ 13.8	36.7	$ 30.4
Cash long-term incentive plan, unrecognized compensation balance	$ 142.2		$ 142.2
Minimum
Cash Long-Term Incentive Plan
Cash long-term incentive plan, equal vesting installments | Installment			3
Cash long-term incentive plan, vesting period			3 years
Maximum
Cash Long-Term Incentive Plan
Cash long-term incentive plan, equal vesting installments | Installment			4
Cash long-term incentive plan, vesting period			4 years

EQUITY, LONG-TERM INCENTIVE C_9

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
ESPP, offering period			6 months
Employee Stock Purchase Plan Additional Information
ESPP maximum annual share replenishment (in shares)	2,000		2,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
ESPP maximum employee subscription rate	15.00%		15.00%
ESPP, discount from market price, lesser of commencement of offering period or purchase date			85.00%
ESPP, Fair Value Assumptions and Methodology
Expected stock price volatility	51.90%	31.60%	51.90%	31.60%
Risk-free interest rate	0.70%	2.40%	0.70%	2.40%
Dividend yield	1.90%	2.50%	1.90%	2.50%
Expected life (in years)	6 months	6 months	6 months	6 months
Employee Stock Purchase Plan Additional Information
Total cash received from employees for the issuance of shares under the ESPP	$ 26,356	$ 24,492	$ 26,356	$ 24,492
Number of shares purchased by employees through the ESPP	161	237	161	237
Tax benefits realized by us in connection with the disqualifying dispositions of shares purchased under the ESPP	$ (3,005)	$ 119	$ 1,164	$ 1,853
Weighted-average fair value per share based on Black-Scholes model (in dollars per share)	$ 52.23	$ 27.35	$ 52.23	$ 27.35
Number of shares available for grant (in shares)	2,500		2,500

EQUITY, LONG-TERM INCENTIVE _10

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 05, 2020	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Dividends Payable
Cash dividends declared (in dollars per share)	$ 0.90	$ 0.90	$ 0.90	$ 0.85	$ 0.75
Payment of dividends		$ 139.6		$ 134.7		$ 280.7	$ 256.3
Restricted stock unit, Performance-based and Service-based
Dividends Payable
Dividends payable		$ 9.5				$ 9.5		$ 8.3

EQUITY, LONG-TERM INCENTIVE _11

EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Non-controlling Interest (Details) $ in Millions	6 Months Ended
	Dec. 31, 2020USD ($)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | PixCell
Noncontrolling Interest [Line Items]
Proceeds from sale of business	$ 21
Orbograph
Noncontrolling Interest [Line Items]
Non-controlling interest, ownership	94.00%
OLTS
Noncontrolling Interest [Line Items]
Non-controlling interest, ownership	97.00%
PixCell
Noncontrolling Interest [Line Items]
Non-controlling interest, ownership	52.00%

STOCK REPURCHASE PROGRAM (Detai

STOCK REPURCHASE PROGRAM (Details) - USD ($) shares in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Equity, Class of Treasury Stock
Shares authorized to be repurchased, amount	$ 3,000,000,000				$ 3,000,000,000
Remaining shares authorized to be repurchased, amount	670,000,000				670,000,000
Total cost of repurchases	$ 177,492,000	$ 193,897,000	$ 280,593,000	$ 228,496,000	$ 371,389,000	$ 509,089,000
Common Stock and Capital in Excess of Par Value, Shares
Equity, Class of Treasury Stock
Number of shares of common stock repurchased (in shares)	774	1,027	1,690	1,659	1,801	3,349

NET INCOME PER SHARE (Details)

NET INCOME PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income attributable to KLA	$ 457,251	$ 420,567	$ 380,555	$ 346,525	$ 877,818	$ 727,080
Denominator:
Weighted-average shares - basic, excluding unvested restricted stock units (in shares)	154,273		157,290		154,777	157,994
Effect of dilutive restricted stock units and options (in shares)	1,287		1,330		1,280	1,320
Weighted-average shares - diluted (in shares)	155,560		158,620		156,057	159,314
Basic net income per share attributable to KLA (in dollars per share)	$ 2.96		$ 2.42		$ 5.67	$ 4.60
Diluted net income per share attributable to KLA (in dollars per share)	$ 2.94		$ 2.40		$ 5.62	$ 4.56
Anti-dilutive securities excluded from the computation of diluted net income (loss) per share (in shares)	0		43		0	25

INCOME TAXES - Details of Incom

INCOME TAXES - Details of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income before income taxes	$ 527,402	$ 424,927	$ 1,011,208	$ 796,443
Provision for income taxes	$ 70,419	$ 44,622	$ 134,083	$ 69,742
Effective tax rate	13.40%	10.50%	13.30%	8.80%

INCOME TAXES - Additional Infor

INCOME TAXES - Additional Information (Details) ₪ in Millions, $ in Millions	Aug. 28, 2019ILS (₪)	Aug. 28, 2019USD ($)	Dec. 31, 2020ILS (₪)	Dec. 31, 2020USD ($)	May 31, 2017ILS (₪)	May 31, 2017USD ($)
Foreign Tax Authority | ITA
Income Tax Examination
Income tax examination, estimate of possible loss	₪ 257	$ 73	₪ 227	$ 68	₪ 229	$ 66

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)Installment	Dec. 31, 2019USD ($)
Receivables Sold Under Factoring Agreements and Proceeds from Sales of LCs
Receivables sold under factoring agreements	$ 49,917	$ 116,935	$ 138,562	$ 173,355
Proceeds from sales of LCs	21,709	$ 10,677	40,839	$ 20,606
Commitments and Contingencies
Purchase commitments	994,900		994,900
Cash-based long-term incentive plan, committed amount	$ 188,700		188,700
Guarantee arrangements to fund customs guarantees for VAT and other operating requirements			73,800
Outstanding guarantee arrangements to fund customs guarantees for VAT and other operating requirements			$ 62,800
Minimum | Cash long-term incentive plan
Commitments and Contingencies
Cash long-term incentive plan, equal vesting installments | Installment			3
Cash long-term incentive plan, percentage of equal vesting installments			33.33%
Cash long-term incentive plan, vesting period			3 years
Maximum | Cash long-term incentive plan
Commitments and Contingencies
Cash long-term incentive plan, equal vesting installments | Installment			4
Cash long-term incentive plan, percentage of equal vesting installments			25.00%
Cash long-term incentive plan, vesting period			4 years

DERIVATIVE INSTRUMENTS AND HE_3

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2015	Jan. 31, 2020
Derivative
Net unrealized gains (losses) arising during the period	$ (1,357)	$ 2,290	$ (2,275)	$ 1,548
Reclassification adjustments increased interest expense on a net basis	(1,115)	(125)	(1,061)	(1,652)
Treasury lock | Portion of senior notes
Derivative
Reclassification adjustments increased interest expense on a net basis	300	$ 100	600	$ 200
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock
Derivative
Net unrealized gains (losses) arising during the period						$ (13,600)	$ 7,500
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock | 2020 Rate Lock Agreements
Derivative
Derivative, notional amount								$ 350,000
Net unrealized gains (losses) arising during the period					$ (21,500)
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts | Treasury lock | Portion of senior notes
Derivative
Unamortized portion of the fair value of derivative contracts	$ 29,600		$ 29,600
Maximum | Derivatives designated as hedging instruments | Cash flow hedge contracts | Treasury lock
Derivative
Term of contract			18 months

DERIVATIVE INSTRUMENTS AND HE_4

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Gains (Losses) on Derivatives in Cash Flow Hedging Relationships Recognized in OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Derivative
Amounts included in the assessment of effectiveness	$ (1,357)	$ 2,290	$ (2,275)	$ 1,548
Foreign exchange contracts
Derivative
Amounts included in the assessment of effectiveness	(1,310)	2,305	(2,182)	1,565
Amounts excluded from the assessment of effectiveness	$ (47)	$ (15)	$ (93)	$ (17)

DERIVATIVE INSTRUMENTS AND HE_5

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Locations and Amounts of Designated and Non-Designated Derivative's Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments
Revenues	$ 1,650,870	$ 1,509,453	$ 3,189,490	$ 2,922,867
Costs of revenues and operating expenses	1,080,706	1,046,622	2,092,937	2,049,788
Interest expense	38,880	40,472	78,266	80,822
Other expense (income), net	3,882	(2,568)	7,079	(4,186)
Amount of gains (losses) reclassified from accumulated OCI to earnings	(1,115)	(125)	(1,061)	(1,652)
Rate lock contracts | Revenue
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	0	0	0	0
Rate lock contracts | Cost of Revenues and Operating Expenses
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	0	0	0	0
Rate lock contracts | Interest Expense
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	(279)	(100)	(558)	(199)
Rate lock contracts | Other Expense (Income), Net
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	0	0	0	0
Foreign exchange contracts | Revenue
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	(560)	85	(650)	560
Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach	(151)	(93)	(278)	(195)
Amount of gains (losses) recognized in earnings	0	0	0	0
Foreign exchange contracts | Cost of Revenues and Operating Expenses
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	(125)	(17)	425	(1,818)
Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach	0	0	0	0
Amount of gains (losses) recognized in earnings	0	0	0	0
Foreign exchange contracts | Interest Expense
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	0	0	0	0
Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach	0	0	0	0
Amount of gains (losses) recognized in earnings	0	0	0	0
Foreign exchange contracts | Other Expense (Income), Net
Derivative Instruments
Amount of gains (losses) reclassified from accumulated OCI to earnings	0	0	0	0
Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach	0	0	0	0
Amount of gains (losses) recognized in earnings	$ 2,661	$ 2,056	$ (2,937)	$ 4,381

DERIVATIVE INSTRUMENTS AND HE_6

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Notional Amount (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Jun. 30, 2020
Derivative
Remaining maturity	13 months	13 months
Derivatives designated as hedging instruments | Purchase | Other foreign currency hedge contracts
Derivative
Derivative, notional amount		$ 311,397	$ 329,310
Derivatives designated as hedging instruments | Purchase | Cash flow hedge contracts
Derivative
Derivative, notional amount		8,344	10,705
Derivatives designated as hedging instruments | Sell | Other foreign currency hedge contracts
Derivative
Derivative, notional amount		321,076	357,939
Derivatives designated as hedging instruments | Sell | Cash flow hedge contracts
Derivative
Derivative, notional amount		$ 95,706	$ 71,431

DERIVATIVE INSTRUMENTS AND HE_7

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Asset derivatives fair value	$ 2,660	$ 2,077
Liability derivatives fair value	3,841	1,410
Other current assets
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Asset derivatives fair value	2,660	2,077
Other current liabilities
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Liability derivatives fair value	3,841	1,410
Derivatives designated as hedging instruments | Other current assets
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Asset derivatives fair value	311	680
Derivatives designated as hedging instruments | Other current liabilities
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Liability derivatives fair value	981	45
Derivatives not designated as hedging instruments | Other current assets
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Asset derivatives fair value	2,349	1,397
Derivatives not designated as hedging instruments | Other current liabilities
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Liability derivatives fair value	2,860	1,365
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Asset derivatives fair value	311	680
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current liabilities
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Liability derivatives fair value	981	45
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Asset derivatives fair value	2,349	1,397
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current liabilities
Derivative Assets and Liabilities, at Fair Value, Net, by Balance Sheet Classification
Liability derivatives fair value	$ 2,860	$ 1,365

DERIVATIVE INSTRUMENTS AND HE_8

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (30,574)	$ (10,006)	$ (29,602)	$ (10,791)
Amount reclassified to earnings	1,115	125	1,061	1,652
Net change in unrealized gains or losses	(1,357)	2,290	(2,275)	1,548
Ending balance	$ (30,816)	$ (7,591)	$ (30,816)	$ (7,591)

DERIVATIVE INSTRUMENTS AND HE_9

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Derivatives - Assets
Derivative - Assets, Gross Amounts of Derivatives	$ 2,660	$ 2,077
Derivatives - Assets, Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets	0	0
Derivatives - Assets, Net Amount of Derivatives Presented in the Condensed Consolidated Balance Sheets	2,660	2,077
Derivatives - Assets, Financial Instruments	(1,527)	(1,020)
Derivatives - Assets, Cash Collateral Received	0	0
Derivatives - Assets, Net Amount	1,133	1,057
Derivatives - Liabilities
Derivatives - Liabilities, Gross Amounts of Derivatives	(3,841)	(1,410)
Derivatives - Liabilities, Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets	0	0
Derivatives - Liabilities, Net Amount of Derivatives Presented in the Condensed Consolidated Balance Sheets	(3,841)	(1,410)
Derivatives - Liabilities, Financial Instruments	1,527	1,020
Derivatives - Liabilities, Cash Collateral Received	0	0
Derivatives - Liabilities, Net Amount	$ (2,314)	$ (390)

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Related Party Transactions [Abstract]
Total revenues	$ 324	$ 2,794	$ 638	$ 3,835
Total purchases	279	$ 249	571	$ 714
Accounts receivables	$ 1,100		$ 1,100		$ 2,400

SEGMENT REPORTING AND GEOGRAP_3

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Additional Information (Details) - segment	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting and Geographic Information
Number of reportable segments			4
Semiconductor Process Control
Segment Reporting and Geographic Information
Number of operating segments			2
Specialty Semiconductor Process
Segment Reporting and Geographic Information
Number of operating segments			1
PCB, Display and Component Inspection
Segment Reporting and Geographic Information
Number of operating segments			2
Other
Segment Reporting and Geographic Information
Number of operating segments			1
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Customer One
Segment Reporting and Geographic Information
Concentration risk, percentage	14.00%	24.00%	14.00%	21.00%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Customer Two
Segment Reporting and Geographic Information
Concentration risk, percentage		10.00%	13.00%	11.00%

SEGMENT REPORTING AND GEOGRAP_4

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Summary of Results for Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020USD ($)segment	Dec. 31, 2019USD ($)
Segment Reporting and Geographic Information
Number of reportable segments | segment			4
Revenues	$ 1,650,870	$ 1,509,453	$ 3,189,490	$ 2,922,867
Operating segments
Segment Reporting and Geographic Information
Revenues	1,650,487	1,509,332	3,188,712	2,922,886
Segment gross margin	1,019,724	919,718	1,974,644	1,776,945
Operating segments | Semiconductor Process Control
Segment Reporting and Geographic Information
Revenues	1,380,184	1,247,430	2,648,138	2,411,062
Segment gross margin	884,090	795,730	1,698,900	1,538,072
Operating segments | Specialty Semiconductor Process
Segment Reporting and Geographic Information
Revenues	90,587	75,106	179,540	144,245
Segment gross margin	51,171	41,333	101,099	79,497
Operating segments | PCB, Display and Component Inspection
Segment Reporting and Geographic Information
Revenues	179,267	186,279	360,444	364,831
Segment gross margin	84,584	82,538	174,753	158,606
Operating segments | Other
Segment Reporting and Geographic Information
Revenues	449	517	590	2,748
Segment gross margin	$ (121)	$ 117	$ (108)	$ 770

SEGMENT REPORTING AND GEOGRAP_5

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Reconciliation of Total Reportable Segments Revenue to Total Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,650,870	$ 1,509,453	$ 3,189,490	$ 2,922,867
Operating segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,650,487	1,509,332	3,188,712	2,922,886
Corporate allocations and effects of foreign exchange rates
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 383	$ 121	$ 778	$ (19)

SEGMENT REPORTING AND GEOGRAP_6

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Reconciliation of Total Segment Gross Margin to Total Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Acquisition-related charges, corporate allocations and effects of foreign exchange rates	$ 38,587	$ 43,883	$ 75,449	$ 91,937
Research and development	229,064	220,751	448,102	431,331
Selling, general and administrative	181,909	192,253	354,540	380,598
Interest expense	38,880	40,472	78,266	80,822
Other expense (income), net	3,882	(2,568)	7,079	(4,186)
Income before income taxes	527,402	424,927	1,011,208	796,443
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross margin	$ 1,019,724	$ 919,718	$ 1,974,644	$ 1,776,945

SEGMENT REPORTING AND GEOGRAP_7

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Schedule of Revenue from External Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting and Geographic Information
Revenues	$ 1,650,870	$ 1,509,453	$ 3,189,490	$ 2,922,867
China
Segment Reporting and Geographic Information
Revenues	382,157	381,752	868,246	727,608
Taiwan
Segment Reporting and Geographic Information
Revenues	380,785	447,083	749,886	833,812
Korea
Segment Reporting and Geographic Information
Revenues	347,947	181,948	537,465	379,398
North America
Segment Reporting and Geographic Information
Revenues	214,808	158,517	384,984	340,500
Japan
Segment Reporting and Geographic Information
Revenues	156,721	194,804	321,140	401,015
Europe and Israel
Segment Reporting and Geographic Information
Revenues	100,201	97,466	183,318	156,849
Rest of Asia
Segment Reporting and Geographic Information
Revenues	$ 68,251	$ 47,883	$ 144,451	$ 83,685
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark
Segment Reporting and Geographic Information
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | China
Segment Reporting and Geographic Information
Concentration risk, percentage	23.00%	25.00%	27.00%	25.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | Taiwan
Segment Reporting and Geographic Information
Concentration risk, percentage	23.00%	30.00%	24.00%	28.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | Korea
Segment Reporting and Geographic Information
Concentration risk, percentage	21.00%	12.00%	17.00%	13.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | North America
Segment Reporting and Geographic Information
Concentration risk, percentage	13.00%	11.00%	12.00%	12.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | Japan
Segment Reporting and Geographic Information
Concentration risk, percentage	10.00%	13.00%	10.00%	14.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | Europe and Israel
Segment Reporting and Geographic Information
Concentration risk, percentage	6.00%	6.00%	6.00%	5.00%
Geographic Concentration Risk | Revenue from Contract with Customer Benchmark | Rest of Asia
Segment Reporting and Geographic Information
Concentration risk, percentage	4.00%	3.00%	4.00%	3.00%

SEGMENT REPORTING AND GEOGRAP_8

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer
Revenues	$ 1,650,870	$ 1,509,453	$ 3,189,490	$ 2,922,867
Wafer Inspection
Revenue from External Customer
Revenues	687,030	606,131	1,206,581	1,054,405
Patterning
Revenue from External Customer
Revenues	307,512	289,078	678,444	671,736
Specialty Semiconductor Process
Revenue from External Customer
Revenues	71,978	60,941	146,005	117,811
PCB, Display and Component Inspection
Revenue from External Customer
Revenues	115,825	129,235	236,451	249,595
Services
Revenue from External Customer
Revenues	412,847	364,903	805,972	720,342
Other
Revenue from External Customer
Revenues	$ 55,678	$ 59,165	$ 116,037	$ 108,978
Product Concentration Risk | Revenue from Contract with Customer Benchmark
Revenue from External Customer
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Product Concentration Risk | Revenue from Contract with Customer Benchmark | Wafer Inspection
Revenue from External Customer
Concentration risk, percentage	42.00%	40.00%	38.00%	36.00%
Product Concentration Risk | Revenue from Contract with Customer Benchmark | Patterning
Revenue from External Customer
Concentration risk, percentage	19.00%	19.00%	21.00%	23.00%
Product Concentration Risk | Revenue from Contract with Customer Benchmark | Specialty Semiconductor Process
Revenue from External Customer
Concentration risk, percentage	4.00%	4.00%	5.00%	4.00%
Product Concentration Risk | Revenue from Contract with Customer Benchmark | PCB, Display and Component Inspection
Revenue from External Customer
Concentration risk, percentage	7.00%	9.00%	7.00%	9.00%
Product Concentration Risk | Revenue from Contract with Customer Benchmark | Services
Revenue from External Customer
Concentration risk, percentage	25.00%	24.00%	25.00%	24.00%
Product Concentration Risk | Revenue from Contract with Customer Benchmark | Other
Revenue from External Customer
Concentration risk, percentage	3.00%	4.00%	4.00%	4.00%

SEGMENT REPORTING AND GEOGRAP_9

SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Land, Property and Equipment, Net by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets
Land, property and equipment, net	$ 594,185	$ 519,824
United States
Revenues from External Customers and Long-Lived Assets
Land, property and equipment, net	391,080	329,558
Israel
Revenues from External Customers and Long-Lived Assets
Land, property and equipment, net	57,562	59,162
Singapore
Revenues from External Customers and Long-Lived Assets
Land, property and equipment, net	68,027	54,946
Europe
Revenues from External Customers and Long-Lived Assets
Land, property and equipment, net	55,979	58,065
Rest of Asia
Revenues from External Customers and Long-Lived Assets
Land, property and equipment, net	$ 21,537	$ 18,093

RESTRUCTURING CHARGES (Details)

RESTRUCTURING CHARGES (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Jun. 30, 2020
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 4.6	$ 8.1
Accelerated depreciation charges	1	2
Restructuring reserve	$ 8.7	$ 8.7	$ 5.7