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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2013 Securities | Dec. 31, 2012 | Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Number of securities below amortized cost basis | 68 |  |  |  |
Number of securities | 77 |  |  |  |
Proceeds from maturities of marketable securities | $ 7,109 |  | $ 17,473 |  |
Available-for-sale securities, amortized cost basis | 57,361 | [1] |  | 64,471 | [2]
Available-for-sale debt securities, unrealized gains | 12 |  |  | 10 |
Available-for-sale debt securities, unrealized losses | (49) |  |  | (86) |
Available-for-sale marketable securities | 57,324 | [1] |  | 64,395 | [2]
Purchased and accrued interest | 446 |  |  | 629 |
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months | 44,863 |  |  | 48,544 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for less than twelve months | (48) |  |  | (85) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 1,815 |  |  | 2,001 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for twelve months or longer | (1) |  |  | (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 | 47,357 | [1] |  | 47,029 | [2]
Available-for-sale debt securities, unrealized gains | 12 |  |  | 10 |
Available-for-sale debt securities, unrealized losses | (28) |  |  | (33) |
Available-for-sale marketable securities | 47,341 | [1] |  | 47,006 | [2]
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 |  |  |  | 17,442 | [2]
Available-for-sale debt securities, unrealized gains |  |  |  | 0 |
Available-for-sale debt securities, unrealized losses |  |  |  | (53) |
Available-for-sale marketable securities |  |  |  | 17,389 | [2]
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 | 27,230 |  |  | 29,911 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for less than twelve months | (23) |  |  | (35) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 1,815 |  |  | 2,001 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for twelve months or longer | (1) |  |  | (1) |
Corporate Bonds | Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | 37,060 | [1] |  | 35,161 | [2]
Available-for-sale debt securities, unrealized gains | 12 |  |  | 10 |
Available-for-sale debt securities, unrealized losses | (25) |  |  | (30) |
Available-for-sale marketable securities | 37,047 | [1] |  | 35,141 | [2]
Corporate Bonds | Non-current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis |  |  |  | 6,439 | [2]
Available-for-sale debt securities, unrealized gains |  |  |  | 0 |
Available-for-sale debt securities, unrealized losses |  |  |  | (6) |
Available-for-sale marketable securities |  |  |  | 6,433 | [2]
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 | 12,226 |  |  | 12,451 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for less than twelve months | (24) |  |  | (49) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |  |  | 0 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |  |  | 0 |
Certificates of Deposit | Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | 2,754 | [1] |  | 1,753 | [2]
Available-for-sale debt securities, unrealized gains | 0 |  |  | 0 |
Available-for-sale debt securities, unrealized losses | (2) |  |  | (2) |
Available-for-sale marketable securities | 2,752 | [1] |  | 1,751 | [2]
Certificates of Deposit | Non-current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | 10,004 | [1] |  | 11,003 | [2]
Available-for-sale debt securities, unrealized gains | 0 |  |  | 0 |
Available-for-sale debt securities, unrealized losses | (21) |  |  | (47) |
Available-for-sale marketable securities | 9,983 | [1] |  | 10,956 | [2]
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 | 5,407 |  |  | 6,182 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for less than twelve months | (1) |  |  | (1) |
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |  |  | 0 |
Unrealized losses of available-for-sale securities in continuous unrealized loss position for twelve months or longer | 0 |  |  | 0 |
Government Municipal Bonds | Current Assets |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, amortized cost basis | 7,543 | [1] |  | 10,115 | [2]
Available-for-sale debt securities, unrealized gains | 0 |  |  | 0 |
Available-for-sale debt securities, unrealized losses | (1) |  |  | (1) |
Available-for-sale marketable securities | $ 7,542 | [1] |  | $ 10,114 | [2]
[1] | Included in amortized cost and fair value is purchased and accrued interest of $446
[2] | Included in amortized cost and fair value is purchased and accrued interest of $629

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