Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Apr. 01, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Tax expense (benefit)	$ 14,160	$ 3,416	$ 14,580	$ 3,383
Favorable impact to operating cash flows			91,345	$ 79,388
New Guidance | Early Adoption
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Tax expense (benefit)			(1,000)
Favorable impact to operating cash flows			1,000
Positive cumulative effect on retained earnings			900
Reduction of additional paid in capital			$ (900)