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Balance Sheet Components - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions		3 Months Ended			4 Months Ended		6 Months Ended
	Feb. 18, 2026	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Jun. 20, 2026	Dec. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	Feb. 28, 2026	Sep. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Depreciation expense		$ 800,000		$ 400,000			$ 1,500,000	$ 800,000
Depreciation and amortization							$ 17,879,000	10,740,000
Stock repurchased and retired during period, (in shares)		0.2					8.3
Stock repurchased and retired during period, value		$ 1,800,000					$ 109,700,000
Shares acquired, average cost per share (in dollars per share)		$ 11.16					$ 13.24
Internal-use software and platform development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Internal-use software and platform development costs		$ 11,200,000		5,900,000			$ 20,400,000	10,500,000
Depreciation and amortization		5,100,000		$ 3,800,000			10,600,000	$ 6,400,000
2025 Share Repurchase Authorization
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount										$ 100,000,000.0
Stock repurchased and retired during period, (in shares)			4.6			2.1
Stock repurchased and retired during period, value			$ 64,000,000.0			$ 36,000,000.0
Shares acquired, average cost per share (in dollars per share)			$ 14.00			$ 17.33
Stock repurchase program, remaining authorized repurchase amount		0					0
2026 Share Repurchase Authorization
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount									$ 300,000,000.0
Stock repurchased and retired during period, (in shares)					3.7
Stock repurchased and retired during period, value					$ 45,700,000
Shares acquired, average cost per share (in dollars per share)					$ 12.31
Stock repurchase program, remaining authorized repurchase amount		$ 254,300,000					$ 254,300,000
Performance Shares \| 2018 Employee Incentive Plan - PSU Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award performance period (in years)	24 months
Share-based compensation arrangement by share-based payment award, award requisite service period (in months)	36 months
Performance Shares \| 2018 Employee Incentive Plan - PSU Award \| Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as percent)	50.00%
Share-based compensation arrangement by share-based payment award, award performance period (in years)	2 years
Performance Shares \| 2018 Employee Incentive Plan - PSU Award \| Share-Based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as percent)	50.00%
Share-based compensation arrangement by share-based payment award, award performance period (in years)	3 years