Summary of Significant Accounting Policies (Tables)

12 Months Ended

May. 31, 2015

Accounting Policies [Abstract]

Roll Forward of Allowance For Doubtful Accounts

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

	2015			2014			2013
Beginning of year	$	555		$	457		$	522
Provision for doubtful accounts	591			860			445
Write-offs	(542		)	(762		)	(510		)
End of year	$	604		$	555		$	457

Summary of Other Assets

Other assets consisted of the following at May 31:

	2015		2014
Net investment in sales-type leases	$	5,876	$	7,264
Supplemental executive retirement plan assets	3,521		3,418
Demonstration equipment	81		6,659
Income taxes receivable	—		1,831
Prepaid and other assets	4,265		2,978
	$	13,743	$	22,150

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, 2015			May 31, 2014
Foreign exchange forward contracts	Other assets	$	(16	)	$	9

Losses Recognized in Income for Derivative Instruments

The table below provides data about the amount of fiscal 2015, 2014 and 2013 gains and losses recognized in income for derivative instruments not designated as hedging instruments:

Derivatives Not Designated as Hedging Instruments	Location of Gain/(Loss) Recognized  in Income on Derivatives	Year ended May 31,
		2015		2014			2013
Foreign exchange forward contracts	Selling, general and administrative expenses	$	1,210	$	(269	)	$	(306	)