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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Sep. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | $ 70,468 | [1] | $ 60,869 | [2]
Available-for-sale securities, unrealized gains |  | 47 |  | 10 |
Available-for-sale securities, unrealized losses |  | (57) |  | (62) |
Available-for-sale marketable securities, fair value |  | 70,458 | [1] | 60,817 | [2]
Purchased and accrued interest |  | 282 |  | 252 |
Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 63,193 | [1] | 47,224 | [2]
Available-for-sale securities, unrealized gains |  | 1 |  | 8 |
Available-for-sale securities, unrealized losses |  | (57) |  | (41) |
Available-for-sale marketable securities, fair value |  | 63,137 | [1] | 47,191 | [2]
Current Assets | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 34,116 | [1] | 31,753 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (43) |  | (39) |
Available-for-sale marketable securities, fair value |  | 34,073 | [1] | 31,714 | [2]
Current Assets | Commercial Paper |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 23,966 | [1] | 7,986 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (12) |  | (1) |
Available-for-sale marketable securities, fair value |  | 23,954 | [1] | 7,985 | [2]
Current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 2,005 | [1] | 6,253 | [2]
Available-for-sale securities, unrealized gains |  | 1 |  | 8 |
Available-for-sale securities, unrealized losses |  | 0 |  | 0 |
Available-for-sale marketable securities, fair value |  | 2,006 | [1] | 6,261 | [2]
Current Assets | Government municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 3,106 | [1] | 1,232 | [2]
Available-for-sale securities, unrealized gains |  | 0 |  | 0 |
Available-for-sale securities, unrealized losses |  | (2) |  | (1) |
Available-for-sale marketable securities, fair value |  | 3,104 | [1] | 1,231 | [2]
Non-current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | [2] |  |  | 13,645 |
Available-for-sale securities, unrealized gains |  |  |  | 2 |
Available-for-sale securities, unrealized losses |  |  |  | (21) |
Available-for-sale marketable securities, fair value | [2] |  |  | 13,626 |
Non-current Assets | Corporate Bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | [2] |  |  | 4,138 |
Available-for-sale securities, unrealized gains |  |  |  | 0 |
Available-for-sale securities, unrealized losses |  |  |  | (12) |
Available-for-sale marketable securities, fair value | [2] |  |  | 4,126 |
Non-current Assets | Certificates of Deposit |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  | 7,275 | [1] | 7,511 | [2]
Available-for-sale securities, unrealized gains |  | 46 |  | 2 |
Available-for-sale securities, unrealized losses |  | 0 |  | (6) |
Available-for-sale marketable securities, fair value |  | $ 7,321 | [1] | 7,507 | [2]
Non-current Assets | Government municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | [2] |  |  | 1,996 |
Available-for-sale securities, unrealized gains |  |  |  | 0 |
Available-for-sale securities, unrealized losses |  |  |  | (3) |
Available-for-sale marketable securities, fair value | [2] |  |  | $ 1,993 |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $282
[2] | Included in amortized cost and fair value is purchased and accrued interest of $252.

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