Summary of Significant Accounting Policies (Tables)

12 Months Ended

May 31, 2013

Roll Forward of Allowance For Doubtful Accounts

A roll forward of the allowance for doubtful accounts is as follows at May 31:

	2013			2012			2011
Beginning of year	$	522		$	602		$	536
Provision for doubtful accounts		445			233			500
Write-offs		(510	)		(313	)		(434	)
End of year	$	457		$	522		$	602

Summary of Other Assets

Other assets consisted of the following at May 31:

	2013		2012
Net investment in sales-type leases	$	9,437	$	11,681
Demonstration equipment		6,057		5,495
Supplemental executive retirement plan assets		2,947		2,370
Income taxes receivable		—		861
Prepaid expenses and other		2,905		2,865
	$	21,346	$	23,272

Fair Value of Foreign Exchange Forward Contracts

The fair value of our foreign exchange forward contracts in the consolidated balance sheets is shown in the table below:

Derivatives Not Designated as Hedging Instruments	Consolidated Balance Sheet Location	May 31, 2013		May 31, 2012
Foreign exchange forward contracts	Other assets	$	114	$	179

Losses Recognized in Income for Derivative Instruments

The table below provides data about the amount of fiscal 2013 and 2012 losses recognized in income for derivative instruments not designated as hedging instruments:

Derivatives Not Designated	Location of Loss Recognized	Year ended May 31,
as Hedging Instruments	in Income on Derivatives	2013		2012
Foreign exchange forward contracts	Selling, general and administrative expenses	$	306	$	507

Supplemental Disclosures of Cash Paid (Refunded)

Supplemental disclosures of cash paid (refunded) during the fiscal year for:

Year ended May 31,	2013		2012			2011
Interest	$	180	$	21		$	56
Income taxes		15,579		(543	)		(2,048	)