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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 10, 2017
Sep. 26, 2017
Related Party Transaction [Line Items]            
Utility and service charges $ 2,434,000 $ 3,475,000 $ 4,645,000 $ 6,246,000    
Nimble Holding Company Limited            
Related Party Transaction [Line Items]            
Nimble's Ownership Interest in Emerson number of shares 15,243,283   15,243,283      
Nimble's Ownership Interest Percentage 68.30%   68.30%      
Nimble Holding Company Limited | Wealth Warrior Global Limited            
Related Party Transaction [Line Items]            
Percentage of outstanding shares acquired           65.90%
Nimble Holding Company Limited | Wealth Warrior Global Limited and its Affiliates            
Related Party Transaction [Line Items]            
Related party ownership percentage         73.90%  
LSSL            
Related Party Transaction [Line Items]            
Due to related parties for utility and service charges $ 0   $ 0      
LSSL | Utility and Service            
Related Party Transaction [Line Items]            
Utility and service charges 300   800      
PAL, SARC and TICL            
Related Party Transaction [Line Items]            
Administrative service fees charged to related parties 6,000   12,000      
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 7,900   $ 7,900      
Security deposit from related parties 39,600          
Advanced payment of rental and utility fees from related parties $ 15,800