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Concentration Risks - Major Customers and Accounts Receivable - Schedule of Concentration Percentage of Different Customers (Parenthetical) (Detail)
3 Months Ended
Dec. 31, 2020
Maximum [Member] | Sales Revenue, Segment [Member] | Customer Concentration Risk [Member] | Faneuil [Member]  
Concentration Risk [Line Items]  
Concentration risk, percentage 10.00%