Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Accounts receivable reserves
Total accounts receivable reserves	$ 101,795	$ 98,848
Allowance for sales returns
Accounts receivable reserves
Total accounts receivable reserves	12,710	13,549
Promotional program incentive allowances
Accounts receivable reserves
Total accounts receivable reserves	85,380	82,827
Allowance for doubtful accounts
Accounts receivable reserves
Total accounts receivable reserves	$ 3,705	$ 2,472