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Debt - Interest Rates (Detail)			6 Months Ended
	Mar. 31, 2021	Mar. 30, 2021	Mar. 31, 2021
Acquisition Corp. | London Interbank Offered Rate (LIBOR) | Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			2.125%
Acquisition Corp. | Federal Funds Effective Swap Rate | Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			0.50%
Acquisition Corp. | Base Rate | Senior Term Loan Facility due 2020
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			1.125%
Term loan base rate plus election rate	1.00%		1.00%
Additional Interest rate on other overdue amounts			2.00%
Revolving Credit Facility | Eurodollar Applicable Margin Rate | 2020 Revolving Loans
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	1.375%	1.875%
Revolving Credit Facility | ABR Applicable Margin Rate | 2020 Revolving Loans
Debt Instrument [Line Items]
Debt instrument, marginal interest rate	0.375%	0.875%
Revolving Credit Facility | Acquisition Corp.
Debt Instrument [Line Items]
Term loan base rate plus election rate	1.00%		1.00%
Interest rate applicable to overdue principal			2.00%
Revolving Credit Facility | Acquisition Corp. | Initial Revolving Loans
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			0.75%
Revolving Credit Facility | Acquisition Corp. | 2020 Revolving Loans
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			0.875%
Senior secured indebtedness to EBITDA ratio	2.98		2.98
Revolving Credit Facility | Acquisition Corp. | London Interbank Offered Rate (LIBOR) | Initial Revolving Loans
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			1.75%
Revolving Credit Facility | Acquisition Corp. | London Interbank Offered Rate (LIBOR) | 2020 Revolving Loans
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			1.875%
Revolving Credit Facility | Acquisition Corp. | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument, marginal interest rate			0.50%

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Additional interest on over due principal.

+ References

No definition available.

+ Details

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- Definition

Additional interest rate on other overdue amounts.

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant, Senior Secured Indebtedness to EBITDA Ratio

+ References

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- Definition

Team loan borrower alternate base rate election rate.

+ References

No definition available.

+ Details

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