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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 ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 € / shares | Mar. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in fair value of contingent consideration | [1] |  |  |  |  |  |  |  | $ (22,087,000) | $ (10,757,000) |  | $ (22,087,000) | $ (10,757,000) |  |
Acquisition purchase price liabilities | [2] |  | $ 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 3 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 3 in the accompanying condensed consolidated financial statements.

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