Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Current assets:
Allowances for returns and doubtful accounts	$ 387,250	$ 358,161
Stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	269,472,871	267,789,992
Common stock, shares outstanding	227,519,892	229,994,216
Treasury stock, shares held	41,952,979	37,795,776