Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013 item	Sep. 30, 2012
Basis of Presentation
Number of business segments	4
Accounts receivable reserves
Total accounts receivable reserves	$ 94,009	$ 87,449
Allowance for sales returns
Accounts receivable reserves
Total accounts receivable reserves	11,628	10,360
Promotional programs incentive allowance
Accounts receivable reserves
Total accounts receivable reserves	77,178	71,845
Allowance for doubtful accounts
Accounts receivable reserves
Total accounts receivable reserves	$ 5,203	$ 5,244