CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 1,530.2	$ 1,749.8
Cost of sales	1,275.1	1,503.8
Gross income	255.1	246.0
Operating expenses:
Selling, general and administrative	144.7	151.3
Amortization of purchased intangibles	13.9	14.4
Total operating expenses	158.6	165.7
Operating income	96.5	80.3
Other income (expense):
Interest expense	(16.2)	(16.4)
Interest income	0.5	2.5
Miscellaneous, net	(1.7)	0.3
Income from continuing operations before income taxes and equity in earnings of unconsolidated affiliates	79.1	66.7
Provision for income taxes	24.7	21.0
Income from continuing operations before equity in earnings of unconsolidated affiliates	54.4	45.7
Equity in earnings of unconsolidated affiliates	0.5	0.6
Income from continuing operations, net of tax	54.9	46.3
Income from discontinued operations, net of tax	0	0.2
Net income	$ 54.9	$ 46.5
Earnings per share attributable to common shareholders-basic:
From continuing operations (in dollars per share)	$ 0.64	$ 0.51
From discontinued operations (in dollars per share)	$ 0.00	$ 0.00
Total earnings (loss) per share attributable to Oshkosh Corporation common shareholders-basic (in dollars per share)	$ 0.64	$ 0.51
Earnings per share attributable to common shareholders-diluted:
From continuing operations (in dollars per share)	$ 0.63	$ 0.51
From discontinued operations (in dollars per share)	$ 0.00	$ 0.00
Total earnings (loss) per share attributable to Oshkosh Corporation common shareholders-diluted (in dollars per share)	$ 0.63	$ 0.51