Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Sep. 30, 2011 Y Segment M D	Sep. 30, 2010	Sep. 30, 2009
Cash and Cash Equivalents
Maximum term of original maturity to classify an instrument as cash equivalent (in months)	3
Minimum period in which customer credit and debit card transactions are settled (in days)	1
Maximum period in which customer credit and debit card transactions are settled (in days)	3
Proceeds due from customers of credit and debit card transactions	$ 10,300,000	$ 8,400,000
Inventory
Average approximate inventory shrinkage, as percentage of consolidated net sales (as a percent)	1.00%
Period of net sales considered for inventory shrinkage (in years)	3
Intangible assets with definite lives
Estimated useful life, low end of range (in years)	1
Estimated useful life, high end of range (in years)	12
Revenue Recognition
Sales returns and allowance, average of net sales (as a percent)	2.00%
Period of sales considered for sales returns and allowances (in years)	3
Shipping and Handling
Shipping and handling costs	41,200,000	36,000,000	30,300,000
Advertising Costs
Advertising costs	70,900,000	64,600,000	55,200,000
Share-Based Compensation
Stock options subject to redemption		$ 946,000