Commitments and Contingencies (Schedule Of Minimum Rental Requirements) (Details) $ in Thousands	Apr. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 2,884
2019	1,258
2020	937
2021	602
2022	119
2023 (and thereafter)	16
Total, Operating	5,816
Capital Leases, Future Minimum Payments, Net Present Value [Abstract]
2018	1,796
2019	1,401
2020	1,167
2021	863
2022	672
2023 (and thereafter)	1,490
Total, Capital	7,389
Less amounts representing interest (2%)	(541)
Total obligations under capital leases	$ 6,848
Minimum [Member]
Capital Leased Assets [Line Items]
Capital leases, interest rate, effective percentage	2.00%
Maximum [Member]
Capital Leased Assets [Line Items]
Capital leases, interest rate, effective percentage	6.50%

Capital Leases of Lessee, Contingent Rentals, Interest Rate, Effective Percentage

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Amount of minimum lease payments for capital leases.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 40
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-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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