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Related Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Related Party Transaction [Line Items]      
Utility and service charges $ 6,755,000 $ 8,787,000  
Nimble Holding Company Limited      
Related Party Transaction [Line Items]      
Nimble's Ownership Interest in Emerson number of shares 15,243,283    
Nimble's Ownership Interest Percentage 72.40%    
GPML and LSSL      
Related Party Transaction [Line Items]      
Utility and service charges $ 0 5,800 $ 13,000
GPML      
Related Party Transaction [Line Items]      
Due to related parties for utility and service charges 0 0  
LSSL      
Related Party Transaction [Line Items]      
Due to related parties for utility and service charges 0 0  
Due from related parties 300 0  
Air conditioning installation charges due 6,000 0  
PAL, SARC and TICL      
Related Party Transaction [Line Items]      
Administrative service fees charged to related parties 0 23,000  
PAL      
Related Party Transaction [Line Items]      
Due from related parties 0 0  
SARC      
Related Party Transaction [Line Items]      
Due from related parties 0 0  
TICL      
Related Party Transaction [Line Items]      
Due from related parties 0 0  
VACL      
Related Party Transaction [Line Items]      
Due from related parties 0 0  
Advanced payment of rental and utility fees from related parties $ 174,000 $ 74,000