Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.21.1
Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Mar. 27, 2020
Mar. 26, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Taxes [Line Items]        
Valuation allowance     $ 5,326,000 $ 5,319,000
Liability unrecognized tax benefits     0 0
Percentage of business interest limitation 50.00% 30.00%    
Investment Tax Credit Carryforward [Member]        
Income Taxes [Line Items]        
Deferred income taxes include the impact of state investment tax credits     321,000  
State investment tax credits with an unlimited carryforward period     $ 794,000  
International Tax Jurisdictions [Member] | Earliest Tax Year [Member] | State Administration of Taxation, China [Member]        
Income Taxes [Line Items]        
Open tax year     2017  
International Tax Jurisdictions [Member] | Earliest Tax Year [Member] | Ministry of Finance, India [Member]        
Income Taxes [Line Items]        
Open tax year     2018  
International Tax Jurisdictions [Member] | Latest Tax Year [Member] | State Administration of Taxation, China [Member]        
Income Taxes [Line Items]        
Open tax year     2020  
International Tax Jurisdictions [Member] | Latest Tax Year [Member] | Ministry of Finance, India [Member]        
Income Taxes [Line Items]        
Open tax year     2020  
International Tax Jurisdictions [Member] | Other Assets [Member]        
Income Taxes [Line Items]        
Deferred income tax asset     $ 0 $ 48,000
Federal Tax Jurisdictions [Member] | Earliest Tax Year [Member]        
Income Taxes [Line Items]        
Open tax year     2017  
Federal Tax Jurisdictions [Member] | Latest Tax Year [Member]        
Income Taxes [Line Items]        
Open tax year     2020  
State Tax Jurisdictions [Member] | Earliest Tax Year [Member]        
Income Taxes [Line Items]        
Open tax year     2016  
State Tax Jurisdictions [Member] | Latest Tax Year [Member]        
Income Taxes [Line Items]        
Open tax year     2020  
Maximum [Member] | Investment Tax Credit Carryforward [Member]        
Income Taxes [Line Items]        
Expiration date of state investment tax credits     Mar. 31, 2035  
Minimum [Member] | Investment Tax Credit Carryforward [Member]        
Income Taxes [Line Items]        
Expiration date of state investment tax credits     Mar. 31, 2022