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Marketable Securities (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 48,384 | $ 49,738
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (193) | (122)
Available-for-sale Securities | 48,191 | 49,616
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis | 23,492 | 18,585
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value | 23,449 | 18,549
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis | 24,892 | 31,153
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value | 24,742 | 31,067
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 682 | 681
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | 0 | 0
Available-for-sale Securities | 682 | 681
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 7,492 | 11,945
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (2) | (20)
Available-for-sale Securities | 7,490 | 11,925
Corporate notes/bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 37,801 | 34,701
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (184) | (100)
Available-for-sale Securities | 37,617 | 34,601
U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,409 | 2,411
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (7) | (2)
Available-for-sale Securities | $ 2,402 | $ 2,409

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