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Marketable Securities (Fair Value and Gross Unrealized Losses for AFS) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | $ 29,947 | $ 48,397
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (24) | (53)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 | 4,102
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (1)
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 26,196 | 24,454
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (20) | (33)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 | 4,102
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (1)
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months |  | 23,943
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (20)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 0
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 3,751 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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