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Commitments and Contingencies - Schedule of Future Minimum Operating Lease and Finance Lease Obligation Payments (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Schedule Of Operating And Capital Leases Future Minimum Payments Due [Line Items]
Less-current maturities of finance lease obligations	$ (361)	$ (338)
Present value of long term finance lease obligations	1,456	1,818
Financing lease obligations [Member]
Schedule Of Operating And Capital Leases Future Minimum Payments Due [Line Items]
2014	472
2015	472
2016	1,098
2017
2018
Thereafter
Total minimum lease payments	2,042
Less-amount representing interest	225
Total future minimum finance lease obligation payments	1,817
Less-current maturities of finance lease obligations	361
Present value of long term finance lease obligations	1,456
Operating Leases [Member]
Schedule Of Operating And Capital Leases Future Minimum Payments Due [Line Items]
2014	11,639
2015	11,931
2016	10,246
2017	9,712
2018	11,294
Thereafter	118,332
Total minimum lease payments	$ 173,154

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal as of the balance sheet date, which qualify for treatment as capital leases, but are presented separately from LTD and capital leases.

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