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Loans Payable and Long-Term Debt (Narrative) (Details)
 9 Months Ended
Jan. 31, 2015
Debt Instrument [Line Items]  
Ratio of total liabilities to tangible net worth 0.6amwd_DebtInstrumentCovenantLiabilitiesToNetWorthRatio
Ratio of cash flow to fixed charges 3.10amwd_DebtInstrumentCovenantCashFlowToFixedChargesRatio
Maximum [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Ratio of total liabilities to tangible net worth 1.4amwd_DebtInstrumentCovenantLiabilitiesToNetWorthRatio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Ratio of cash flow to fixed charges 1.5amwd_DebtInstrumentCovenantCashFlowToFixedChargesRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember