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Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands
Common Stock [Member]
Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Beginning Balance at Sep. 30, 2008$ 64,031$ 114,804$ 664,855 $ 843,690
Beginning Balance (in shares) at Sep. 30, 200864,031    
Net income  250,745 250,745
Restricted stock awards185(185)   
Restricted stock awards (in shares)185    
Exercise of employee stock options20174  194
Exercise of employee stock options (in shares)20    
Stock option and restricted stock award compensation expense 7,664  7,664
Ending Balance at Sep. 30, 200964,236122,457915,600 1,102,293
Ending Balance (in shares) at Sep. 30, 200964,236    
Net income  256,996 256,996
Restricted stock awards145(145)   
Restricted stock awards (in shares)145    
Exercise of employee stock options62785  847
Exercise of employee stock options (in shares)62    
Stock option and restricted stock award compensation expense 9,998  9,998
Ending Balance at Sep. 30, 201064,443133,0951,172,596 1,370,134
Ending Balance (in shares) at Sep. 30, 201064,443    
Net income  271,674 271,674
Other comprehensive loss   (1,527)(1,527)
Restricted stock awards102(102)   
Restricted stock awards (in shares)102    
Exercise of employee stock options4155,777  6,192
Exercise of employee stock options (in shares)415    
Stock option and restricted stock award compensation expense 6,314  6,314
Ending Balance at Sep. 30, 2011$ 64,960$ 145,084$ 1,444,270$ (1,527)$ 1,652,787
Ending Balance (in shares) at Sep. 30, 201164,960