Consolidated Balance Sheet - USD ($) $ in Thousands	Feb. 28, 2019	May 31, 2018
Current Assets
Cash and cash equivalents	$ 93,576	$ 83,074
Marketable securities (at fair value, which approximates cost)	153,104	127,736
Accounts receivable, less allowance of $1,700 and $1,550	80,011	79,086
Inventories	84,870	76,005
Prepaid expenses and other current assets	11,041	9,888
Total Current Assets	422,602	375,789
Net Property and Equipment	76,453	73,069
Other Assets
Goodwill	104,077	99,558
Other non-amortizable intangible assets	15,658	14,783
Total Assets	672,585	618,009
Current Liabilities
Accounts payable	18,952	20,750
Accrued compensation	5,391	6,065
Income taxes	0	165
Other accruals	9,925	11,708
Total Current Liabilities	34,268	38,688
Deferred Income Taxes	14,211	14,103
Other Non-Current Liabilities	4,190	5,043
Total Liabilities	52,669	57,834
Commitments and Contingencies (Note 8)
Equity
Preferred stock, $1.00 par value, 100,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.16 par value, 120,000,000 shares authorized, 52,120,422 and 51,735,732 shares issued and outstanding at February 28, 2019 and May 31, 2018, respectively	8,339	8,278
Additional paid-in capital	217,274	202,572
Accumulated other comprehensive loss	(9,129)	(9,746)
Retained earnings	403,432	359,071
Total Stockholders' Equity	619,916	560,175
Total Liabilities and Equity	672,585	618,009
Customer-based intangibles
Other Assets
Amortizable intangible assets, net of accumulated amortization	30,007	31,841
Other Intangible Assets
Other Assets
Amortizable intangible assets, net of accumulated amortization	$ 23,788	$ 22,969

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682