Retirement Plans (Fair Values Of The Qualified Plan's Assets) (Details) - USD ($) $ in Thousands		Sep. 27, 2015		Sep. 28, 2014		Sep. 29, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 332,657		$ 356,312
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,629		900
Equity, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15,812		17,063
Commingled [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		169,701		147,221
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		7,243		13,122
Government And Mortgage Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets				11,631
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		88,621		121,666
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		36,967		32,593
Diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10,684		12,116
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		236,123		202,053
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	3,629		900
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	15,812		17,063
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Commingled [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	169,701		147,221
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	7,243		13,122
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Government And Mortgage Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			11,631
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[6]	29,054		0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[7]	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[8]	10,684		12,116
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		59,567		121,666
Significant Other Observable Inputs (Level 2) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	0		0
Significant Other Observable Inputs (Level 2) [Member] | Equity, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0		0
Significant Other Observable Inputs (Level 2) [Member] | Commingled [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	0		0
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	0		0
Significant Other Observable Inputs (Level 2) [Member] | Government And Mortgage Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			0
Significant Other Observable Inputs (Level 2) [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[6]	59,567		121,666
Significant Other Observable Inputs (Level 2) [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[7]	0		0
Significant Other Observable Inputs (Level 2) [Member] | Diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[8]	0		0
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		36,967	[7]	32,593
Significant Unobservable Inputs (Level 3) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	0		0
Significant Unobservable Inputs (Level 3) [Member] | Equity, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[2]	0		0
Significant Unobservable Inputs (Level 3) [Member] | Commingled [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[3]	0		0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[4]	0		0
Significant Unobservable Inputs (Level 3) [Member] | Government And Mortgage Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[5]			0
Significant Unobservable Inputs (Level 3) [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[6]	0		0
Significant Unobservable Inputs (Level 3) [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		36,967	[7]	32,593	[7]	$ 29,352
Significant Unobservable Inputs (Level 3) [Member] | Diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[8]	$ 0		$ 0

[1] Cash and cash equivalents are comprised of commercial paper, short-term bills and notes, and short-term investment funds, which are valued at unadjusted quoted market prices.

[2] U.S. equity securities are comprised of investments in common stock of U.S. companies for total return purposes. These investments are valued by the trustee at closing prices from national exchanges on the valuation date.

[3] Commingled equity securities are comprised of investments in mutual funds, the fair value of which is determined by reference to the fund’s underlying assets, which are primarily marketable equity securities that are traded on national exchanges and valued at unadjusted quoted market prices.

[4] Corporate bonds are comprised of mutual funds traded on national securities exchanges, valued at unadjusted quoted market prices, as well as securities traded in markets that are not considered active, which are valued based on quoted market prices, broker/dealer quotations

[5] Government and mortgage securities are comprised of government and municipal bonds, including treasury bills, notes and index linked bonds which are valued using an unadjusted quoted price in an active market or observable, market-based inputs.

[6] Other fixed income securities are comprised of other commingled funds invested in registered securities which are valued at the unadjusted quoted price in an active market (level 1) or exchange and long-duration US government/credit funds which are valued based on observable inputs, which include quoted market prices in active markets for similar securities, valuations based on commonly quoted benchmark interest rates, maturities, ratings and/or securities indices (level 2)

[7] Real estate is investments in a real estate investment trust for purposes of total return. These investments are valued at unit values provided by the investment managers and their consultants.

[8] Diversified funds are comprised of exchange-traded commodities futures and treasury bills, which are valued at unadjusted quoted market prices.