Fair Values (Details) - USD ($) $ in Thousands		Jan. 02, 2016	Oct. 03, 2015
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Supplemental Employee Retirement Plans, Defined Benefit | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	[1]	$ 14,815	$ 13,891
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial Assets, Balance Sheet Location [Member] | Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value disclosure		53,622	38,666
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial Assets, Balance Sheet Location [Member] | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value disclosure		48,622	38,666
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	[2]	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	[2]	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Debt [Member] | Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Domesticlineofcreditdrawn		(5,000)
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market fund deposits | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		21,763	8,297
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Paper [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes and obligations | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[4]	17,044	16,478
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | US And International Government [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Supplemental Employee Retirement Plans, Defined Benefit | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	[1]	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Financial Assets, Balance Sheet Location [Member] | Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value disclosure		188,261	178,688
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Financial Assets, Balance Sheet Location [Member] | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value disclosure		187,877	178,449
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value		380	239
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value		1,780	217
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	[2]	1,780	258
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	[2]	(384)	(239)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value		4	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value		0	41
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Money market fund deposits | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	9,497	9,740
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Corporate notes and obligations | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	19,803	17,942
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[4]	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member] | US And International Government [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	147,487	150,748
Fair Value, Measurements, Recurring | Total Fair Value | Supplemental Employee Retirement Plans, Defined Benefit | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	[1]	14,815	13,891
Fair Value, Measurements, Recurring | Total Fair Value | Financial Assets, Balance Sheet Location [Member] | Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value disclosure		241,883	217,354
Fair Value, Measurements, Recurring | Total Fair Value | Financial Assets, Balance Sheet Location [Member] | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value disclosure		236,499	217,115
Fair Value, Measurements, Recurring | Total Fair Value | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	[2]	1,780	258
Fair Value, Measurements, Recurring | Total Fair Value | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	[2]	(384)	(239)
Fair Value, Measurements, Recurring | Total Fair Value | Money market fund deposits | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		21,763	8,297
Fair Value, Measurements, Recurring | Total Fair Value | Commercial Paper [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	9,497	9,740
Fair Value, Measurements, Recurring | Total Fair Value | Corporate notes and obligations | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	19,803	17,942
Fair Value, Measurements, Recurring | Total Fair Value | Equity Securities [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[4]	17,044	16,478
Fair Value, Measurements, Recurring | Total Fair Value | US And International Government [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	[3]	147,487	$ 150,748
Line of Credit, Domestic [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Domesticlineofcreditdrawn		$ (5,000)

[1] The fair value of mutual funds is determined based on quoted market prices. Securities traded on a national exchange are stated at the last reported sales price on the day of valuation; other securities traded in over-the-counter markets and listed securities for which no sale was reported on that date are stated as the last quoted bid price.

[2] The principal market in which we execute our foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large commercial banks. Our foreign currency contracts’ valuation inputs are based on quoted prices and quoted pricing intervals from public data sources and do not involve management judgment. At January 2, 2016, prepaid expenses and other assets include $1,780 non-designated forward contracts and $0 foreign currency contracts designated for cash flow hedges, respectively; other current liabilities include $380 non-designated forward contracts and $4 foreign currency contracts designated for cash flow hedges, respectively. At October 3, 2015, prepaid expenses and other assets include $217 non-designated forward contracts and $41 foreign currency contracts designated for cash flow hedges, respectively; other current liabilities include $239 non-designated forward contracts and $0 foreign currency contracts designated for cash flow hedges, respectively. See Note 6, "Derivative Instruments and Hedging Activities".

[3] Valuations are based upon quoted market prices in active markets involving similar assets. The market inputs used to value these instruments generally consist of market yields, reported trades, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. Pricing sources include industry standard data providers, security master files from large financial institutions, and other third party sources which are input into a distribution-curve-based algorithm to determine a daily market value. This creates a “consensus price” or a weighted average price for each security.

[4] Valuations are based upon quoted market prices.