Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Accounts receivable reserves
Total accounts receivable reserves	$ 124,266	$ 101,741
Promotional program incentive allowances
Accounts receivable reserves
Total accounts receivable reserves	107,852	83,768
Allowance for sales returns
Accounts receivable reserves
Total accounts receivable reserves	13,990	15,409
Allowance for doubtful accounts
Accounts receivable reserves
Total accounts receivable reserves	$ 2,424	$ 2,564