Separate Financial Information of Subsidiary Guarantors of Indebtedness (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Current assets:
Cash and cash equivalents	$ 313.8	$ 733.5	$ 540.7	$ 428.5	$ 428.5
Receivables, net	974.9	794.3
Inventories, net	960.9	822.0
Other current assets	134.7	203.6
Total current assets	2,384.3	2,553.4
Investment in and advances to consolidated subsidiaries	0	0
Intangible assets, net	1,683.4	1,755.7
Other long-term assets	519.0	456.6
Total assets	4,586.7	4,765.7	4,947.8
Current liabilities:
Accounts payable	586.7	531.7
Customer advances	310.1	294.4
Other current liabilities	414.8	554.6
Total current liabilities	1,311.6	1,380.7
Long-term debt, less current maturities	875.0	890.0
Other long-term liabilities	415.1	387.2
Shareholders' Equity:
Total shareholders’ equity	1,985.0	2,107.8
Total liabilities and shareholders' equity	4,586.7	4,765.7
Oshkosh Corporation
Current assets:
Cash and cash equivalents	281.8	711.7	500.0		376.3
Receivables, net	35.3	23.5
Inventories, net	0	0
Other current assets	32.2	112.4
Total current assets	349.3	847.6
Investment in and advances to consolidated subsidiaries	5,375.8	4,932.0
Intangible assets, net	0	0
Other long-term assets	109.3	82.3
Total assets	5,880.6	5,894.6
Current liabilities:
Accounts payable	14.4	16.5
Customer advances	0	0
Other current liabilities	110.5	139.6
Total current liabilities	124.9	156.1
Long-term debt, less current maturities	875.0	890.0
Other long-term liabilities	79.8	71.7
Shareholders' Equity:
Total shareholders’ equity	1,985.0	2,107.8
Total liabilities and shareholders' equity	5,880.6	5,894.6
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	4.7	2.7	5.5		13.5
Receivables, net	756.4	627.6
Inventories, net	624.3	586.6
Other current assets	78.0	70.4
Total current assets	1,463.4	1,287.3
Investment in and advances to consolidated subsidiaries	1,009.3	840.0
Intangible assets, net	1,028.3	1,069.8
Other long-term assets	224.1	239.4
Total assets	4,752.3	4,464.7
Current liabilities:
Accounts payable	485.1	454.4
Customer advances	308.1	291.1
Other current liabilities	210.6	321.9
Total current liabilities	1,003.8	1,067.4
Long-term debt, less current maturities	0	0
Other long-term liabilities	190.0	175.9
Shareholders' Equity:
Total shareholders’ equity	1,160.0	796.9
Total liabilities and shareholders' equity	4,752.3	4,464.7
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	27.3	19.1	35.2		38.7
Receivables, net	233.7	180.8
Inventories, net	337.7	236.5
Other current assets	24.1	20.5
Total current assets	622.8	456.9
Investment in and advances to consolidated subsidiaries	(337.1)	(553.4)
Intangible assets, net	655.1	685.9
Other long-term assets	185.6	134.9
Total assets	5,313.6	4,791.3
Current liabilities:
Accounts payable	137.7	90.9
Customer advances	2.0	3.3
Other current liabilities	94.4	101.4
Total current liabilities	234.1	195.6
Long-term debt, less current maturities	0	0
Other long-term liabilities	145.3	139.6
Shareholders' Equity:
Total shareholders’ equity	4,888.0	4,421.7
Total liabilities and shareholders' equity	5,313.6	4,791.3
Eliminations
Current assets:
Cash and cash equivalents	0	0	0		0
Receivables, net	(50.5)	(37.6)
Inventories, net	(1.1)	(1.1)
Other current assets	0.4	0.3
Total current assets	(51.2)	(38.4)
Investment in and advances to consolidated subsidiaries	(6,048.0)	(5,218.6)
Intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(11,359.8)	(10,384.9)
Current liabilities:
Accounts payable	(50.5)	(30.1)
Customer advances	0	0
Other current liabilities	(0.7)	(8.3)
Total current liabilities	(51.2)	(38.4)
Long-term debt, less current maturities	0	0
Other long-term liabilities	0	0
Shareholders' Equity:
Total shareholders’ equity	(6,048.0)	(5,218.6)
Total liabilities and shareholders' equity	$ (11,359.8)	$ (10,384.9)