XML 60 R34.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair value of financial instruments (Details) (USD $)
 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value $ 146,002,000   $ 191,685,000
Amortization of net premium on short-term investments 2,720,000 3,269,000  
Financial liabilities measured at fair value on a recurring basis 0   0
Short-term investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 130,651,000   165,898,000
Short-term investments | Certificates of deposit
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   1,003,000
Short-term investments | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 104,753,000   148,993,000
Short-term investments | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,997,000   3,391,000
Short-term investments | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 23,901,000   12,511,000
Total
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 132,687,000   168,139,000
Total | Short-term investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 130,651,000   165,898,000
Total | Short-term investments | Certificates of deposit
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   1,003,000
Total | Short-term investments | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 104,753,000   148,993,000
Total | Short-term investments | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,997,000   3,391,000
Total | Short-term investments | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 23,901,000   12,511,000
Total | Cash equivalents
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 2,036,000   2,241,000
Total | Cash equivalents | Money market mutual funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,036,000   2,241,000
Total | Cash equivalents | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,000,000    
Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,036,000   2,241,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments | Certificates of deposit
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,036,000   2,241,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents | Money market mutual funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,036,000   2,241,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash equivalents | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0    
Significant Other Observable Inputs (Level 2)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 131,651,000   165,898,000
Significant Other Observable Inputs (Level 2) | Short-term investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 130,651,000   165,898,000
Significant Other Observable Inputs (Level 2) | Short-term investments | Certificates of deposit
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   1,003,000
Significant Other Observable Inputs (Level 2) | Short-term investments | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 104,753,000   148,993,000
Significant Other Observable Inputs (Level 2) | Short-term investments | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,997,000   3,391,000
Significant Other Observable Inputs (Level 2) | Short-term investments | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 23,901,000   12,511,000
Significant Other Observable Inputs (Level 2) | Cash equivalents
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,000,000   0
Significant Other Observable Inputs (Level 2) | Cash equivalents | Money market mutual funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Other Observable Inputs (Level 2) | Cash equivalents | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 1,000,000    
Significant Unobservable Inputs (Level 3)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Short-term investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Short-term investments | Certificates of deposit
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Short-term investments | Municipal securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Short-term investments | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Short-term investments | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Cash equivalents
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Cash equivalents | Money market mutual funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value 0   0
Significant Unobservable Inputs (Level 3) | Cash equivalents | Commercial paper
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Estimated Fair Value $ 0