Fair Values (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Oct. 01, 2011
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency contracts	$ 1,162	[1]	$ 181	[2]
Total Fair Value | Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	6,174	[3]	7,830	[4]
Total Fair Value | Money market fund deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	9,351	[5]	8,135	[5]
Total Fair Value | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	8,003	[6]	65,941	[5]
Total Fair Value | U.S. and international government obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	91,675	[7]	62,079	[8]
Total Fair Value | Corporate notes and obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	43,278	[9]	48,967	[10]
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency contracts	0	[1]	0	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	6,174	[3]	7,830	[4]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Supplemental Employee Retirement Plans, Defined Benefit | Prepaid expenses and other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	2,841		2,844
Quoted Prices in Active Markets for Identical Assets (Level 1) | Supplemental Employee Retirement Plans, Defined Benefit | Other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	3,333		4,986
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market fund deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	9,351	[5]	8,135	[5]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	[6]	0	[5]
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and international government obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	[7]	0	[8]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes and obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	[9]	0	[10]
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency contracts	1,162	[1]	181	[2]
Significant Other Observable Inputs (Level 2) | Prepaid expenses and other assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency contracts	1,324		578
Significant Other Observable Inputs (Level 2) | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency contracts	(162)		(397)
Significant Other Observable Inputs (Level 2) | Supplemental Employee Retirement Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Mutual funds - Deferred comp and supplemental plan	0	[3]	0	[4]
Significant Other Observable Inputs (Level 2) | Money market fund deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	[5]	0	[5]
Significant Other Observable Inputs (Level 2) | Money market fund deposits | Cash and cash equivalent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			59,431
Significant Other Observable Inputs (Level 2) | Money market fund deposits | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure			6,510
Significant Other Observable Inputs (Level 2) | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	8,003	[6]	65,941	[5]
Significant Other Observable Inputs (Level 2) | Certificates of deposit | Cash and cash equivalent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	6,000
Significant Other Observable Inputs (Level 2) | Certificates of deposit | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	2,003
Significant Other Observable Inputs (Level 2) | U.S. and international government obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	91,675	[7]	62,079	[8]
Significant Other Observable Inputs (Level 2) | U.S. and international government obligations | Cash and cash equivalent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	6,020		60,978
Significant Other Observable Inputs (Level 2) | U.S. and international government obligations | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	85,655		1,101
Significant Other Observable Inputs (Level 2) | Corporate notes and obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	43,278	[9]	48,967	[10]
Significant Other Observable Inputs (Level 2) | Corporate notes and obligations | Cash and cash equivalent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	1,825		3,436
Significant Other Observable Inputs (Level 2) | Corporate notes and obligations | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 41,453		$ 45,531

[1] Includes $1,324 recorded in prepaid expenses and other assets and $162 recorded in other current liabilities on the Condensed Consolidated Balance Sheet (see Note 5).

[2] Includes $578 recorded in prepaid expenses and other assets and $397 recorded in other current liabilities on the Condensed Consolidated Balance Sheet.

[3] Includes $2,841 recorded in prepaid expenses and other assets and $3,333 recorded in other assets on the Condensed Consolidated Balance Sheet.

[4] Includes $2,844 recorded in prepaid expenses and other assets and $4,986 recorded in other assets on the Condensed Consolidated Balance Sheet.

[5] Included in cash and cash equivalents on the Condensed Consolidated Balance Sheet.

[6] Includes $6,000 recorded in cash and cash equivalents and $2,003 recorded in short-term investments on the Condensed Consolidated Balance Sheet.

[7] Includes $6,020 recorded in cash and cash equivalents and $85,655 recorded in short-term investments on the Condensed Consolidated Balance Sheet.

[8] Includes $59,431 recorded in cash and cash equivalents and $6,510 recorded in short-term investments on the Condensed Consolidated Balance Sheet.

[9] Includes $1,825 recorded in cash and cash equivalents and $41,453 recorded in short-term investments on the Condensed Consolidated Balance Sheet.

[10] Includes $60,978 recorded in cash and cash equivalents and $1,101 recorded in short-term investments on the Condensed Consolidated Balance Sheet.