Sales of Receivables - Summary of MARPA Activity (Detail) - USD ($) $ in Thousands		Sep. 30, 2021		Sep. 30, 2020		Jun. 30, 2020	Jun. 30, 2019
Transfers And Servicing Of Financial Assets [Abstract]
Outstanding balance sold to Purchaser		$ 193,516	[1]	$ 184,205	[1]	$ 182,027	$ 200,000
Sales of receivables		690,132		626,603
Cash collections		(678,643)		(642,398)
Cash collected, not remitted to Purchaser	[2]	(51,034)		(79,804)
Remaining sold receivables		$ 142,482		$ 104,401

[1] For the three months ended September 30, 2021 and 2020, the Company recorded a net cash inflow of $11.5 million and a net cash outflow of $15.8 million in its cash flows from operating activities, respectively, from sold receivables.  MARPA cash flows are calculated as the change in the outstanding balance during the fiscal year.

[2] Includes the cash collected on behalf of but not yet remitted to the Purchaser as of September 30, 2021 and 2020.  This balance is included in other accrued expenses and current liabilities as of the balance sheet date.