Financial Instruments and Fair Value Measurements (Schedule of Weighted Average Interest Rates Used to Calculate Long-Term Debt Fair Value) (Details)	Jun. 30, 2012	Sep. 30, 2011
Financial Instruments and Fair Value Measurments
Long-term debt, weighted-average interest rate used to estimate fair value	2.40%	2.60%

Represents the weighted average interest rates used to estimate fair value of long-term debt at fixed interest rates calculated based on a model that discounted future principal and interest payments at interest rates available to the company at the end of the period for similar debt of the same maturity.

No definition available.

Name:	wwd_LongTermDebtFairValueWeightedAverageInterestRate
Namespace Prefix:	wwd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant