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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]      
Revenue $ 3,643,538 $ 3,563,637 $ 3,345,854
Operating expenses:      
Cost of revenue 2,349,488 2,306,892 2,167,052
Research and development 254,944 257,896 240,266
Selling, general and administrative 440,085 445,134 418,574
Amortization of purchased intangible assets and other 70,073 58,067 38,410
Restructuring charges 13,000    
Total operating expenses 3,127,590 3,067,989 2,864,302
Operating income 515,948 495,648 481,552
Interest and other expense, net 2,544 6,098 6,075
Income before income taxes 513,404 489,550 475,477
Income taxes 67,241 67,428 63,038
Net income $ 446,163 $ 422,122 $ 412,439
Basic earnings per share $ 2.89 $ 2.65 $ 2.56
Diluted earnings per share $ 2.85 $ 2.62 $ 2.53