Basis of Presentation (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Accounts receivable reserves
Total accounts receivable reserves	$ 120,104	$ 101,741
Promotional program incentive allowances
Accounts receivable reserves
Total accounts receivable reserves	99,072	83,768
Allowance for sales returns
Accounts receivable reserves
Total accounts receivable reserves	18,235	15,409
Allowance for doubtful accounts
Accounts receivable reserves
Total accounts receivable reserves	$ 2,797	$ 2,564