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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	May 31, 2012
Accrued liabilities
Payroll and related expenses	$ 8,585	$ 7,754
Accrued severance	2,901	2,087
Deferred revenue	2,957	3,138
Royalties	1,913	2,258
Sales and franchise taxes	1,287	1,092
Interest rate swap at fair value	1,059
Other	4,048	4,473
Total	$ 22,750	$ 20,802

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. 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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Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. 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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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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