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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | $ 60,869 | [1] | $ 44,471 | [2]
Available-for-sale securities, unrealized gains | 11 |  | 17 |
Available-for-sale securities, unrealized losses | (63) |  | (49) |
Available-for-sale marketable securities, fair value | 60,817 | [1] | 44,439 | [2]
Purchased and accrued interest | 252 |  | 629 |
Current Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 47,224 |  | 32,918 |
Available-for-sale securities, unrealized gains | 8 |  | 3 |
Available-for-sale securities, unrealized losses | (40) |  | (23) |
Available-for-sale marketable securities, fair value | 47,192 |  | 32,898 |
Current Assets | Corporate bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 31,753 |  | 24,668 |
Available-for-sale securities, unrealized gains | 0 |  | 1 |
Available-for-sale securities, unrealized losses | (39) |  | (22) |
Available-for-sale marketable securities, fair value | 31,714 |  | 24,647 |
Current Assets | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 7,986 |  | 3,998 |
Available-for-sale securities, unrealized gains | 0 |  | 0 |
Available-for-sale securities, unrealized losses | (1) |  | (1) |
Available-for-sale marketable securities, fair value | 7,985 |  | 3,997 |
Current Assets | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 6,253 |  | 4,252 |
Available-for-sale securities, unrealized gains | 8 |  | 2 |
Available-for-sale securities, unrealized losses | 0 |  | 0 |
Available-for-sale marketable securities, fair value | 6,261 |  | 4,254 |
Current Assets | Government municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 1,232 |  |  |
Available-for-sale securities, unrealized gains | 0 |  |  |
Available-for-sale securities, unrealized losses | 0 |  |  |
Available-for-sale marketable securities, fair value | 1,232 |  |  |
Non-current Assets |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 13,645 |  | 11,553 |
Available-for-sale securities, unrealized gains | 3 |  | 14 |
Available-for-sale securities, unrealized losses | (23) |  | (26) |
Available-for-sale marketable securities, fair value | 13,625 |  | 11,541 |
Non-current Assets | Corporate bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 4,138 |  | 2,051 |
Available-for-sale securities, unrealized gains | 0 |  | 0 |
Available-for-sale securities, unrealized losses | (13) |  | (4) |
Available-for-sale marketable securities, fair value | 4,125 |  | 2,047 |
Non-current Assets | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 7,511 |  | 9,502 |
Available-for-sale securities, unrealized gains | 3 |  | 14 |
Available-for-sale securities, unrealized losses | (7) |  | (22) |
Available-for-sale marketable securities, fair value | 7,507 |  | $ 9,494 |
Non-current Assets | Government municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities, amortized cost basis | 1,996 |  |  |
Available-for-sale securities, unrealized gains | 0 |  |  |
Available-for-sale securities, unrealized losses | (3) |  |  |
Available-for-sale marketable securities, fair value | $ 1,993 |  |  |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $252.
[2] | Included in amortized cost and fair value is purchased and accrued interest of $629

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