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Intangible Assets and Goodwill (Components of Gross and Net Intangible Asset Balances) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 247,299 $ 247,286  
Accumulated Amortization 241,867 240,745  
Net Carrying Amount $ 5,432 $ 6,541 $ 5,432
Developed Technology      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Amortization Period 2 years 10 months 24 days 3 years  
Gross Carrying Amount $ 170,492 $ 170,480  
Accumulated Amortization 166,506 165,908  
Net Carrying Amount $ 3,986 $ 4,572  
Customer Relationships      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Amortization Period 9 months 18 days 1 year  
Gross Carrying Amount $ 64,825 $ 64,824  
Accumulated Amortization 63,468 62,961  
Net Carrying Amount $ 1,357 $ 1,863  
Trade Names      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Amortization Period 0 years 0 years  
Gross Carrying Amount $ 10,700 $ 10,700  
Accumulated Amortization 10,700 10,700  
Net Carrying Amount $ 0 $ 0  
License Agreements      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Amortization Period 1 year 2 months 12 days 1 year 4 months 24 days  
Gross Carrying Amount $ 1,282 $ 1,282  
Accumulated Amortization 1,193 1,176  
Net Carrying Amount $ 89 $ 106