Loans Payable and Long-Term Debt (Narrative) (Details)	6 Months Ended
	Oct. 31, 2015
Debt Instrument [Line Items]
Ratio of total liabilities to tangible net worth	0.7
Ratio of cash flow to fixed charges	3.15
Maximum [Member]
Debt Instrument [Line Items]
Ratio of total liabilities to tangible net worth	1.4
Minimum [Member]
Debt Instrument [Line Items]
Ratio of cash flow to fixed charges	1.5