Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Tax expense (benefit)	$ 10,433	$ 7,975	$ 25,013	$ 11,358
Favorable impact to operating cash flows			138,871	$ 118,612
New Guidance | Early Adoption
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Tax expense (benefit)			(2,300)
Favorable impact to operating cash flows			2,300
Positive cumulative effect on retained earnings			900
Reduction of additional paid in capital			$ (900)