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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