Summary of Significant Accounting Policies (Details Textuals 1) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Maturity period of cash equivalents at the time of purchase	Three months or less
Summary of Significant Accounting Policies (Textuals) [Abstract]
Depreciation and amortization expense	$ 348,522	$ 347,402	$ 312,321
Amortization expense of capitalized software	23,173	32,181	46,485
Shipping expense	$ 276,797	$ 255,765	$ 250,941
Maximum [Member]
Maturity period of Short-Term Investment at the time of purchase	1 year
Useful life of capitalized computer software	10 years
Minimum [Member]
Maturity period of Short-Term Investment at the time of purchase	3 months