SCHEDULE II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Changes in valuation and qualifying accounts
Balance at end of period	$ 101,741	$ 98,848
Inventory reserves
Changes in valuation and qualifying accounts
Balance at beginning of period	21,753	19,712	22,364
Additions, Charged to costs and expenses	6,006	2,041	(2,652)
Balance at end of period	27,759	21,753	19,712
Allowance for doubtful accounts
Changes in valuation and qualifying accounts
Balance at beginning of period	2,472	5,244	5,376
Additions, Charged to costs and expenses	988	(2,588)	297
Deductions	(896)	(184)	(429)
Balance at end of period	2,564	2,472	5,244
Promotional program incentive allowances
Changes in valuation and qualifying accounts
Balance at beginning of period	82,827	71,845	74,593
Additions, Charged to costs and expenses	329,562	329,683	307,371
Deductions	(328,621)	(318,701)	(310,119)
Balance at end of period	83,768	82,827	71,845
Allowance for sales returns
Changes in valuation and qualifying accounts
Balance at beginning of period	13,549	10,360	10,793
Additions, Charged to costs and expenses	37,521	31,087	28,333
Deductions	(35,661)	(27,898)	(28,766)
Balance at end of period	15,409	13,549	10,360
Valuation allowance for deferred tax assets
Changes in valuation and qualifying accounts
Balance at beginning of period	14,116	14,867	15,404
Additions, Charged to costs and expenses	(1,269)	829	1,240
Deductions	(3,304)	(1,580)	(1,777)
Balance at end of period	$ 9,543	$ 14,116	$ 14,867