Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
 1 Months Ended 12 Months Ended
Feb. 29, 2008
Jun. 30, 2010
Mar. 31, 2012
Jun. 30, 2011
Fair Value Measurements [Abstract]        
Cash excluded from fair value measurement     $ 141,200,000 $ 165,900,000
Time deposits excluded from fair value measurement     69,663,000 [1] 65,402,000 [1]
Auction Failure in Par Value 48,200,000      
Auction Rate Securities, Sold at Par   16,800,000    
Auction rate securities
        
Fair Value Measurements [Abstract]        
Securities, Contractual Maturity Date (in years), Low   20    
Securities, Contractual Maturity Date (in years), High   30    
Total
        
Fair Value Measurements        
Marketable securities     2,158,840,000 [2] 1,807,277,000 [3]
Derivative assets     4,149,000 1,970,000
Executive Deferred Savings Plan        
EDSP money market and other     1,974,000 1,806,000
EDSP mutual funds     128,174,000 126,227,000
Executive Deferred Savings Plan total     130,148,000 128,033,000
Total Financial Assets     2,293,137,000 [2] 1,937,280,000 [3]
Derivative liabilities     (585,000) (2,127,000)
Total Financial Liabilities     (585,000) (2,127,000)
Total | Money market and other
        
Fair Value Measurements        
Cash Equivalents     551,568,000 481,770,000
Total | U.S. Treasury securities
        
Fair Value Measurements        
Cash Equivalents     1,900,000 4,400,000
Marketable securities     93,888,000 54,496,000
Total | U.S. Government agency securities
        
Fair Value Measurements        
Cash Equivalents     9,963,000 6,010,000
Marketable securities     551,790,000 314,173,000
Total | Municipal securities
        
Fair Value Measurements        
Marketable securities     41,768,000 38,957,000
Total | Corporate debt securities
        
Fair Value Measurements        
Cash Equivalents     31,999,000 21,982,000
Marketable securities     840,124,000 853,403,000
Total | Sovereign securities
        
Fair Value Measurements        
Marketable securities     33,897,000 32,086,000
Total | Equity Securities [Member]
        
Fair Value Measurements        
Marketable securities     1,943,000  
Level 1
        
Fair Value Measurements        
Marketable securities     1,214,515,000 [2] 869,045,000 [3]
Derivative assets     0 0
Executive Deferred Savings Plan        
EDSP money market and other     1,974,000 1,806,000
EDSP mutual funds     92,820,000 95,971,000
Executive Deferred Savings Plan total     94,794,000 97,777,000
Total Financial Assets     1,309,309,000 [2] 966,822,000 [3]
Derivative liabilities     0 0
Total Financial Liabilities     0 0
Level 1 | Money market and other
        
Fair Value Measurements        
Cash Equivalents     551,568,000 481,770,000
Level 1 | U.S. Treasury securities
        
Fair Value Measurements        
Cash Equivalents     0 0
Marketable securities     87,390,000 52,396,000
Level 1 | U.S. Government agency securities
        
Fair Value Measurements        
Cash Equivalents     9,963,000 6,010,000
Marketable securities     551,790,000 314,173,000
Level 1 | Municipal securities
        
Fair Value Measurements        
Marketable securities     0 0
Level 1 | Corporate debt securities
        
Fair Value Measurements        
Cash Equivalents     0 0
Marketable securities     0 0
Level 1 | Sovereign securities
        
Fair Value Measurements        
Marketable securities     11,861,000 14,696,000
Level 1 | Equity Securities [Member]
        
Fair Value Measurements        
Marketable securities     1,943,000  
Level 2
        
Fair Value Measurements        
Marketable securities     944,325,000 [2] 938,232,000 [3]
Derivative assets     4,149,000 1,970,000
Executive Deferred Savings Plan        
EDSP money market and other     0 0
EDSP mutual funds     35,354,000 30,256,000
Executive Deferred Savings Plan total     35,354,000 30,256,000
Total Financial Assets     983,828,000 [2] 970,458,000 [3]
Derivative liabilities     (585,000) (2,127,000)
Total Financial Liabilities     (585,000) (2,127,000)
Level 2 | Money market and other
        
Fair Value Measurements        
Cash Equivalents     0 0
Level 2 | U.S. Treasury securities
        
Fair Value Measurements        
Cash Equivalents     1,900,000 4,400,000
Marketable securities     6,498,000 2,100,000
Level 2 | U.S. Government agency securities
        
Fair Value Measurements        
Cash Equivalents     0 0
Marketable securities     0 0
Level 2 | Municipal securities
        
Fair Value Measurements        
Marketable securities     41,768,000 38,957,000
Level 2 | Corporate debt securities
        
Fair Value Measurements        
Cash Equivalents     31,999,000 21,982,000
Marketable securities     840,124,000 853,403,000
Level 2 | Sovereign securities
        
Fair Value Measurements        
Marketable securities     22,036,000 17,390,000
Level 2 | Equity Securities [Member]
        
Fair Value Measurements        
Marketable securities     $ 0  
[1] Time deposits excluded from fair value measurements.
[2] Excludes cash of $141.2 million held in operating accounts and time deposits of $69.7 million as of March 31, 2012.
[3] Excludes cash of $165.9 million held in operating accounts and time deposits of $65.4 million as of June 30, 2011.