Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands  | 
Sep. 30, 2023  | 
Mar. 31, 2023  | 
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| Finite Lived Intangible Assets [Line Items] | ||
| Cost | $ 493,295 | $ 495,888 | 
| Accumulated Amortization | (147,903) | (116,256) | 
| Net | $ 345,392 | $ 379,632 | 
| Customer relationships | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Weighted-Average Remaining Useful Life | 12 years 3 days | 12 years 21 days | 
| Cost | $ 168,405 | $ 170,281 | 
| Accumulated Amortization | (49,400) | (39,925) | 
| Net | $ 119,005 | $ 130,356 | 
| Developed technology | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Weighted-Average Remaining Useful Life | 4 years 9 months 14 days | 5 years 3 months 10 days | 
| Cost | $ 146,337 | $ 146,596 | 
| Accumulated Amortization | (49,070) | (38,813) | 
| Net | $ 97,267 | $ 107,783 | 
| Trade names | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Weighted-Average Remaining Useful Life | 1 year 9 months 29 days | 2 years 3 months 29 days | 
| Cost | $ 69,894 | $ 69,983 | 
| Accumulated Amortization | (36,255) | (27,115) | 
| Net | $ 33,639 | $ 42,868 | 
| Publisher relationships | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Weighted-Average Remaining Useful Life | 17 years 4 months 6 days | 17 years 9 months 29 days | 
| Cost | $ 108,659 | $ 109,028 | 
| Accumulated Amortization | (13,178) | (10,403) | 
| Net | $ 95,481 | $ 98,625 | 
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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