Acquired Intangible Assets - Additional Information (Detail)	9 Months Ended
	Jun. 25, 2016
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized acquired intangible assets with definite lives useful period (in years)	3 years
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized acquired intangible assets with definite lives useful period (in years)	7 years