Debt Intruments (narrative) (detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016
Debt Instruments [Abstract]
Line of Credit Facility, Amount Outstanding	$ 342,935,000	$ 304,468,000	$ 342,935,000	$ 304,468,000	$ 342,935,000
Line of Credit Facility [Line Items]
Repayment of Notes Payable			22,596,000
Inventory Change	10,293,000		10,293,000		10,293,000
Defined Benefit Plan, Contributions by Employer			300,000	600,000
Purchase Price	38,795,000		38,795,000		38,795,000
Net Earnings (Loss)	6,144,000	$ 6,522,000	6,082,000	$ 9,490,000	51,050,000
Accounts Receivable Change	19,431,000		19,431,000		19,431,000
Production Period [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	500,000,000		500,000,000		500,000,000
Nonproduction Period [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 400,000,000		$ 400,000,000		$ 400,000,000