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Stock-Based Compensation (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Number of stock shares authorized for grants 7,410us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements 18,004us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Unrecognized compensation cost is expected to be recognized over a weighted-average period 2 years  
Forfeiture rate, Board of Directors 0.00%wwd_EmployeeServiceShareBasedCompensationNonvestedAwardsUnrecognizedCompensationCostForfeitureRateBoardOfDirector  
Forfeiture rate, non-Board of Directors 9.00%wwd_EmployeeServiceShareBasedCompensationNonvestedAwardsUnrecognizedCompensationCostForfeitureRateNonBoardOfDirectors  
Stock Options [Member]    
Vesting period, in years 4 years  
Vesting rate 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Vested contractual term, in years 10 years  
Restricted Stock Award [Member]    
Vesting period, in years 4 years  
Shares granted, Number of Shares   24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Service period for restricted stock award 4 years