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Acquisitions - Additional Information (Detail) |  |  |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended |  |
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Oct. 26, 2021 USD ($) | Sep. 30, 2021 USD ($) shares | Jul. 16, 2021 USD ($) shares | Jun. 17, 2021 USD ($) shares | May 25, 2021 USD ($) shares | Apr. 29, 2021 USD ($) | Mar. 02, 2021 USD ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | [1] | Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | [1] | Sep. 30, 2021 € / shares | Mar. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in fair value of contingent consideration |  |  |  |  |  |  |  |  | $ (22,087,000) | [1] | $ (10,757,000) |  | $ (22,087,000) | [2] | $ (10,757,000) |  |
Acquisition purchase price liabilities | [3] |  | $ 335,500,000 |  |  |  |  |  | 335,500,000 |  |  | $ 335,500,000 | 335,500,000 |  |  |  | $ 0
Fyber |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 95.10% |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  |  |  |  |  | $ 124,336,000 |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
Business acquisition, stock issued (in shares) | shares |  |  | 18,000 | 1,040,364 | 1,500,000 | 3,216,935 |  |  |  |  |  | 5,775,299 |  |  |  |  |
Business acquisition, value of stock issued |  |  |  | $ 64,253,000 | $ 92,640,000 | $ 198,678,000 |  |  |  |  |  | $ 359,233,000 |  |  |  |  |
Contingent consideration, revenue threshold, minimum |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration, maximum |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition, stock reduction (in shares) | shares |  |  | 41,289 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 31,000,000 |  |  |  |  |  | 31,000,000 |  |  | $ 31,000,000 | $ 31,000,000 |  |  |  |
Additional equity interest purchased |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |  |  |
Cumulative voting interest acquired |  |  | 99.40% |  |  |  |  |  | 99.40% |  |  | 99.40% | 99.40% |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | $ 8,116,000 |  |  |  | $ 11,715,000 |  |  |  |
Fyber | Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, stock issued (in shares) | shares |  |  |  |  |  |  |  |  | 59,289 |  |  | 5,816,588 |  |  |  |  |
Business acquisition, value of stock issued |  |  |  |  |  |  |  |  | $ 3,662,000 |  |  |  |  |  |  |  |
Fyber | Minority Fyber Shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, per share price (in EUR per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0.84 |
Fyber | Publisher relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Fyber | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Fyber | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Fyber | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
AdColony |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration, maximum |  |  |  |  |  |  | 225,000,000 |  |  |  |  |  |  |  |  |  |
Acquisition purchase price liabilities, unpaid cash consideration |  |  | $ 100,000,000 |  |  |  | $ 100,000,000 |  | 100,000,000 |  |  | $ 100,000,000 | 100,000,000 |  |  |  |
Acquisition purchase price liabilities, unpaid cash consideration, payment term |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 204,500,000 |  |  |  |  |  | 204,500,000 |  |  | $ 204,500,000 | 204,500,000 |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | 620,000 |  |  |  | $ 3,491,000 |  |  |  |
Estimated contingent consideration, minimum |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
Reduction in fair value of contingent consideration |  |  |  |  |  |  |  |  | $ 8,913,000 |  |  |  |  |  |  |  |
AdColony | Publisher relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
AdColony | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |
AdColony | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |
AdColony | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
AdColony | Minimum | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |
AdColony | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | $ 425,000,000 |  |  |  |  |  |  |  |  |  |
AdColony | Maximum | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
AdColony | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 98,175,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Appreciate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | $ 20,003,000 |  |  |  |  |  |  |  |  |
Business combination, retention bonus liability recognized |  |  |  |  |  |  |  | 6,000,000,000 |  |  |  |  |  |  |  |  |
Goodwill, tax deductible |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
[1] | In the quarter ending June 30, 2021, the Company initiated two significant acquisitions. Please refer to Note 4 in the accompanying condensed consolidated financial statements.
[2] | In the quarter ending June 30, 2021, the Company initiated two significant acquisitions. Please refer to Note 4 in the accompanying condensed consolidated financial statements.
[3] | In the quarter ending June 30, 2021, the Company initiated two significant acquisitions. Please refer to Note 4 in the accompanying condensed consolidated financial statements.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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