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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 Securities | Jun. 30, 2013 | Jun. 30, 2014 Securities | Jun. 30, 2013 | Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Number of securities below amortized cost basis | 24 |  |  | 24 |  |  |  |
Number of securities | 65 |  |  | 65 |  |  |  |
Proceeds from maturities of marketable securities | $ 21,600 |  | $ 13,600 | $ 35,364 |  | $ 51,773 |  |
Available-for-sale securities, amortized cost basis | 44,681 | [1] |  | 44,681 | [1] |  | 64,471 | [2]
Available-for-sale securities, unrealized gains | 25 |  |  | 25 |  |  | 10 |
Available-for-sale securities, unrealized losses | (39) |  |  | (39) |  |  | (86) |
Available-for-sale marketable securities, fair value | 44,667 |  |  | 44,667 |  |  | 64,395 |
Purchased and accrued interest | 327 |  |  | 327 |  |  | 629 |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 20,372 |  |  | 20,372 |  |  | 48,544 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (36) |  |  | (36) |  |  | (85) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 1,997 |  |  | 1,997 |  |  | 2,001 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) |  |  | (3) |  |  | (1) |
Current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, next twelve months, maximum year mature |  |  |  | 1 year |  |  |  |
Available-for-sale securities, amortized cost basis | 32,349 | [1] |  | 32,349 | [1] |  | 47,029 | [2]
Available-for-sale securities, unrealized gains | 4 |  |  | 4 |  |  | 10 |
Available-for-sale securities, unrealized losses | (24) |  |  | (24) |  |  | (33) |
Available-for-sale marketable securities, fair value | 32,329 |  |  | 32,329 |  |  | 47,006 |
Non-current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, year two through five, maximum year mature |  |  |  | 3 years |  |  |  |
Available-for-sale securities, amortized cost basis | 12,332 | [1] |  | 12,332 | [1] |  | 17,442 | [2]
Available-for-sale securities, unrealized gains | 21 |  |  | 21 |  |  | 0 |
Available-for-sale securities, unrealized losses | (15) |  |  | (15) |  |  | (53) |
Available-for-sale marketable securities, fair value | 12,338 |  |  | 12,338 |  |  | 17,389 |
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 | 19,874 |  |  | 19,874 |  |  | 29,911 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (34) |  |  | (34) |  |  | (35) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |  |  | 0 |  |  | 2,001 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |  |  | 0 |  |  | (1) |
Corporate Bonds | Current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, amortized cost basis | 23,253 | [1] |  | 23,253 | [1] |  | 35,161 | [2]
Available-for-sale securities, unrealized gains | 2 |  |  | 2 |  |  | 10 |
Available-for-sale securities, unrealized losses | (23) |  |  | (23) |  |  | (30) |
Available-for-sale marketable securities, fair value | 23,232 |  |  | 23,232 |  |  | 35,141 |
Corporate Bonds | Non-current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, amortized cost basis | 5,079 | [1] |  | 5,079 | [1] |  | 6,439 | [2]
Available-for-sale securities, unrealized gains | 0 |  |  | 0 |  |  | 0 |
Available-for-sale securities, unrealized losses | (11) |  |  | (11) |  |  | (6) |
Available-for-sale marketable securities, fair value | 5,068 |  |  | 5,068 |  |  | 6,433 |
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 | 498 |  |  | 498 |  |  | 12,451 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) |  |  | (2) |  |  | (49) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 1,997 |  |  | 1,997 |  |  | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) |  |  | (3) |  |  | 0 |
Certificates of Deposit | Current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, amortized cost basis | 4,002 | [1] |  | 4,002 | [1] |  | 1,753 | [2]
Available-for-sale securities, unrealized gains | 2 |  |  | 2 |  |  | 0 |
Available-for-sale securities, unrealized losses | (1) |  |  | (1) |  |  | (2) |
Available-for-sale marketable securities, fair value | 4,003 |  |  | 4,003 |  |  | 1,751 |
Certificates of Deposit | Non-current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, amortized cost basis | 7,253 | [1] |  | 7,253 | [1] |  | 11,003 | [2]
Available-for-sale securities, unrealized gains | 21 |  |  | 21 |  |  | 0 |
Available-for-sale securities, unrealized losses | (4) |  |  | (4) |  |  | (47) |
Available-for-sale marketable securities, fair value | 7,270 |  |  | 7,270 |  |  | 10,956 |
Government Municipal 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 |  |  |  |  |  |  | 6,182 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  |  |  |  |  | (1) |
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 |
Government Municipal Bonds | Current Assets |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, amortized cost basis | 5,094 | [1] |  | 5,094 | [1] |  | 10,115 | [2]
Available-for-sale securities, unrealized gains | 0 |  |  | 0 |  |  | 0 |
Available-for-sale securities, unrealized losses | 0 |  |  | 0 |  |  | (1) |
Available-for-sale marketable securities, fair value | $ 5,094 |  |  | $ 5,094 |  |  | $ 10,114 |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $327
[2] | Included in amortized cost and fair value is purchased and accrued interest of $629

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