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Business Acquisitions (Narrative) (Details) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 04, 2021 USD ($) | Jun. 30, 2022 USD ($) business | Jun. 30, 2021 USD ($) business | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 1,603,340,000 |  | $ 1,531,455,000
Goodwill acquired during period |  | 81,725,000 |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  | $ 1,636,000 |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | business |  | 2 | 1 |
Fiscal 2022 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue of acquiree since acquisition date |  | $ 7,400,000 |  |
Total consideration of transactions |  | 107,100,000 |  |
Fair value of accounts receivable acquired |  | 6,700,000 |  |
Amount expected to be uncollectable |  | 0 |  |
Goodwill |  | 81,725,000 |  |
Expected income tax deductible amount |  | 1,200,000 |  |
Accounts receivable |  | 6,703,000 |  |
Fiscal 2022 Acquisitions | Digital Media |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  | 1,800,000 |  |
Fiscal 2022 Acquisitions | Cybersecurity and Martech |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Increase (decrease) in goodwill from adjustment under purchase accounting |  | $ (100,000) |  |
Fiscal 2021 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue of acquiree since acquisition date |  |  | $ 5,800,000 |
Total consideration of transactions |  |  | 91,000,000 |
Goodwill |  |  | 55,439,000 |
Accounts receivable |  |  | $ 3,278,000 |
SEOmoz Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue of acquiree since acquisition date |  |  |  | 3,300,000
Total consideration of transactions | $ 67,000,000 |  |  |
Amount expected to be uncollectable | 300,000 |  |  |
Goodwill | 41,192,000 |  |  |
Goodwill acquired during period |  |  |  | 41,200,000
Expected income tax deductible amount |  |  |  | $ 0
Accounts receivable | 3,278,000 |  |  |
Gross amounts due under contracts | $ 3,600,000 |  |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126966197&loc=d3e6578-128477 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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