Revenue Recognition (Tables)

3 Months Ended

Aug. 31, 2020

Disaggregation Of Revenue [Line Items]

Revenue by Product Class and Over Time

The following tables summarize net sales by product class and by timing of revenue recognition for the periods presented:

(in thousands)	Three months ended August 31,
Reportable segments by product class:	2020		2019
Steel Processing
Direct	$	404,808	$	493,646
Toll		26,212		29,729
Total		431,020		523,375
Pressure Cylinders
Consumer products		132,782		119,480
Industrial products		128,225		152,618
Oil & gas equipment		9,897		32,298
Total		270,904		304,396
Other
Engineered Cabs		985		28,066
Other		-		22
Total		985		28,088
Total	$	702,909	$	855,859

Summary of Unbilled Receivable and Contract Assets

The following table summarizes the unbilled receivables and contract assets for the periods indicated:

		August 31,		May 31,
(in thousands)	Balance Sheet Classification	2020		2020
Unbilled receivables	Receivables	$	4,325	$	5,552
Contract assets	Prepaid and other current assets	$	5,114	$	4,127

Over time revenue

Disaggregation Of Revenue [Line Items]

Revenue by Product Class and Over Time

The following table summarizes the over time revenue for the periods presented:

	Three months ended August 31,
(in thousands)	2020		2019
Steel Processing - toll	$	26,212	$	29,729
Pressure Cylinders - certain oil & gas equipment contracts		7,699		30,008
Total over time revenue	$	33,911	$	59,737