Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Sep. 30, 2014
Accounts receivable reserves
Total accounts receivable reserves	$ 89,807	$ 89,807	$ 101,741
Correction of immaterial errors
Reduction of selling, general and administrative expenses	(2,520)	(2,520)
Reduction of cost of sales	0	0
Increase in label inventory	3,708	3,708
Promotional program incentive allowances
Accounts receivable reserves
Total accounts receivable reserves	71,403	71,403	83,768
Allowance for sales returns
Accounts receivable reserves
Total accounts receivable reserves	15,821	15,821	15,409
Allowance for doubtful accounts
Accounts receivable reserves
Total accounts receivable reserves	$ 2,583	$ 2,583	$ 2,564