SCHEDULE II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Changes in valuation and qualifying accounts
Balance at beginning of period	$ 101,741
Balance at end of period	103,768	$ 101,741
Inventory reserves
Changes in valuation and qualifying accounts
Balance at beginning of period	30,654	24,648	$ 22,607
Additions, Charged to costs and expenses	6,475	6,006	2,041
Balance at end of period	37,129	30,654	24,648
Allowance for doubtful accounts
Changes in valuation and qualifying accounts
Balance at beginning of period	2,564	2,472	5,244
Additions, Charged to costs and expenses	619	988	(2,588)
Deductions	(583)	(896)	(184)
Balance at end of period	2,600	2,564	2,472
Promotional program incentive allowances
Changes in valuation and qualifying accounts
Balance at beginning of period	83,768	82,827	71,845
Additions, Charged to costs and expenses	373,509	329,562	329,683
Deductions	(373,189)	(328,621)	(318,701)
Balance at end of period	84,088	83,768	82,827
Allowance for sales returns
Changes in valuation and qualifying accounts
Balance at beginning of period	15,409	13,549	10,360
Additions, Charged to costs and expenses	36,813	37,521	31,087
Deductions	(35,142)	(35,661)	(27,898)
Balance at end of period	17,080	15,409	13,549
Valuation allowance for deferred tax assets
Changes in valuation and qualifying accounts
Balance at beginning of period	9,543	14,116	14,867
Additions, Charged to costs and expenses		(1,269)	829
Deductions	(1,559)	(3,304)	(1,580)
Balance at end of period	$ 7,984	$ 9,543	$ 14,116