Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes - Narrative (Details)

v3.20.1
Income Taxes Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax asset, increase (decrease), amount $ 5,800,000 $ 112,700,000    
Change in U.S. valuation allowance   67,800,000    
Deferred tax assets, valuation allowance $ 64,477,000 $ 58,658,000    
Statutory tax rate, percent 21.00% 21.00% 31.60%  
Deferred tax liabilities, unremitted foreign earnings $ 0      
Unrecognized tax benefits 19,367,000 $ 18,877,000 $ 8,680,000 $ 7,390,000
Unrecognized tax benefits that would impact effective tax rate 17,400,000      
Amount of unrecorded benefit 5,800,000      
Income tax penalties and interest accrued 500,000 500,000    
Net foreign taxable income reported on prior year federal income tax return 40,100,000      
Income tax expense (benefit) $ 38,526,000 $ (39,460,000) $ 9,132,000  
Macedonia        
Operating Loss Carryforwards [Line Items]        
Statutory tax rate, percent 0.00% 10.00% 10.00%  
THAILAND        
Operating Loss Carryforwards [Line Items]        
Statutory tax rate, percent 0.00% 20.00%    
Valuation Allowance for Deferred Tax Assets        
Operating Loss Carryforwards [Line Items]        
Valuation allowances and reserves $ 64,477,000 $ 58,658,000 $ 171,401,000 $ 163,898,000
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax asset, increase (decrease), amount   44,900,000    
Operating loss carryforwards 114,400,000      
Operating loss carryforwards subject to expiration within one year 0      
Deferred tax assets, valuation allowance 41,000,000.0      
Foreign Tax Authority | Changes in Temporary Differences and Net Operating Utilizations of Deferred Tax Assets        
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax asset, increase (decrease), amount   (35,500,000)    
Foreign Tax Authority | Release of Valuation Allowance of Deferred Tax Assets        
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax asset, increase (decrease), amount   (5,500,000)    
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 82,400,000      
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 75,300,000      
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 7,100,000      
Deferred tax assets, valuation allowance 23,500,000      
Domestic Tax Authority | Release of Valuation Allowance of Deferred Tax Assets        
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax asset, increase (decrease), amount   (44,200,000)    
Domestic Tax Authority | Operating Loss Carryforwards of Deferred Tax Assets        
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax asset, increase (decrease), amount   $ (26,900,000)    
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 545,000,000.0      
Operating loss carryforwards subject to expiration within one year $ 1,600,000      
Operating loss carryforwards, expiration period 1 year      
Investment Tax Credit Carryforward [Member] | Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Fiscal Year of Expiration Dec. 31, 2028      
Texas franchise tax credits        
Operating Loss Carryforwards [Line Items]        
Fiscal Year of Expiration Dec. 31, 2026      
Minimum | U.S. research credits        
Operating Loss Carryforwards [Line Items]        
Fiscal Year of Expiration Dec. 31, 2022      
Maximum [Member] | U.S. research credits        
Operating Loss Carryforwards [Line Items]        
Fiscal Year of Expiration Dec. 31, 2025