Accounting Changes and Recent Accounting Pronouncements - Effect of ASU No. 2014-09 Adoption on Condensed Consolidated Statement of Earnings (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Recent Accounting Pronouncements
Net sales	$ 945,852	$ 975,321	$ 1,935,305	$ 1,970,286
Gross Profit	468,324	486,322	949,030	972,951
Selling, general and administrative expenses	361,626	$ 368,461	728,614	$ 739,748
ASU 2014-09 \| Excluding ASU No. 2014-09 Effect
Recent Accounting Pronouncements
Net sales	945,752		1,935,130
Gross Profit	468,224		948,855
Selling, general and administrative expenses	361,526		728,439
ASU 2014-09 \| ASU No. 2014-09 Effect
Recent Accounting Pronouncements
Net sales	100		175
Gross Profit	100		175
Selling, general and administrative expenses	$ 100		$ 175

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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