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New Accounting Pronouncements - Additional Information (Detail) - USD ($)		12 Months Ended
	Oct. 01, 2019	Sep. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings, net of tax as a result of adopting new standard		$ 202,455,000		$ 166,071,000
Cumulative effect adjustment to increase in retained earnings, net of tax		399,000
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings, net of tax as a result of adopting new standard		$ 305,000	$ 399,000
Accounting Standards Update 2016-02 [Member] | Minimum [Member] | Subsequent Event [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, liabilities	$ 39,000,000
Operating lease, right-of-use asset	39,000,000
Cumulative effect adjustment to increase in retained earnings, net of tax	500,000
Accounting Standards Update 2016-02 [Member] | Maximum [Member] | Subsequent Event [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, liabilities	54,000,000
Operating lease, right-of-use asset	54,000,000
Cumulative effect adjustment to increase in retained earnings, net of tax	$ 1,200,000

X

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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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