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Long-term and Short-term Debt (Details Textuals 2) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Former Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Borrowing capacity   $ 750.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rok_FormerCreditFacilityMember
New Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Borrowing capacity 1,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= rok_NewCreditFacilityMember		  
Expiration date Mar. 24, 2020  
Option to increase borrowing capacity of credit facility $ 350.0rok_Optiontoincreaseborrowingcapacityofcreditfacility
/ us-gaap_CreditFacilityAxis
= rok_NewCreditFacilityMember