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Summary of Significant Accounting Policies - Summary of Fair Value, Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Apr. 30, 2020	Sep. 30, 2019	Jun. 03, 2019
Business Combination, Contingent Consideration, Liability	$ (27,202)	$ (8,068)		$ (27,202)
Derivative Liability, Noncurrent	713
Interest Rate Swap [Member]
Derivative Liability, Noncurrent	(713)		$ 0
Commitments [Member]
Business Combination, Contingent Consideration, Liability	(20,909)		(27,202)
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Interest Rate Swap [Member]
Derivative Liability, Noncurrent	0		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commitments [Member]
Business Combination, Contingent Consideration, Liability	0		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Derivative Liability, Noncurrent	(713)		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commitments [Member]
Business Combination, Contingent Consideration, Liability	0		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Interest Rate Swap [Member]
Derivative Liability, Noncurrent	0		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commitments [Member]
Business Combination, Contingent Consideration, Liability	$ (20,909)		$ (27,202)