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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 22, 2017
Apr. 01, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Deferred tax asset increase $ 116,300,000        
Deferred tax asset, valuation allowance $ 106,500,000        
Decrease in valuation allowance     $ 87,400,000    
Undistributed earnings available for repatriation     2,600,000    
Deferred tax liabilities     110,000 $ 125,000  
Reversal of uncertain tax positions     0 $ 0 $ 0
Austria          
Net operating loss carryforwards     46,500,000    
China          
Net operating loss carryforwards     $ 11,700,000    
Net operating loss carryforward period     5 years    
Federal          
Net operating loss carryforwards     $ 871,000,000    
Net operating loss carryforwards, indefinite carryforward     89,000,000    
Research and development and other tax credit carryforwards     9,500,000    
State          
Net operating loss carryforwards     232,000,000    
Research and development and other tax credit carryforwards     3,300,000    
Foreign earnings repatriated          
Deferred tax liabilities     100,000    
Power Quality Systems, Inc.          
Net operating loss carryforwards     3,700,000    
Infinia Technology Corporation (ITC)          
Net operating loss carryforwards     $ 300,000    
Accounting Standards Update 2016-09          
Deferred tax asset increase   $ 18,000,000      
Deferred tax asset, valuation allowance   $ 18,000,000