Basis of Presentation (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Accounts receivable reserves
Total accounts receivable reserves	$ 96,555	$ 90,854
Allowance for sales returns
Accounts receivable reserves
Total accounts receivable reserves	10,464	10,793
Promotional programs incentive allowance
Accounts receivable reserves
Total accounts receivable reserves	80,872	74,593
Allowance for doubtful accounts
Accounts receivable reserves
Total accounts receivable reserves	$ 5,219	$ 5,468