Annual report pursuant to Section 13 and 15(d)

Transactions with Related Parties - Additional Information (Detail)

v3.8.0.1
Transactions with Related Parties - Additional Information (Detail) - Contract Packaging, Inc. - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Related Party Transaction [Line Items]      
Percentage of shares held by CPI in Tech Pac 20.00% 20.00% 20.00%
Amount due to related party $ 0.6 $ 1.5  
Tech Pac      
Related Party Transaction [Line Items]      
Purchases products from related party $ 37.0 $ 36.5 $ 35.2