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Accrued Liabilities Including Other Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Accrued Liabilities And Other Non Current Liabilities [Line Items]
Accrued compensation	$ 10,252	$ 5,926
Accrued taxes	5,883	1,288
Accrued other liabilities	16,255	5,511
Accrued expenses and other current liabilities	$ 32,390	$ 12,725

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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