Segment Reporting (Revenues by Service Offering by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 83.0	$ 145.8
Southwest
Segment Reporting Information [Line Items]
Revenues	24.4	58.0
Rocky Mountains
Segment Reporting Information [Line Items]
Revenues	33.8	48.6
Northeast/Mid-Con
Segment Reporting Information [Line Items]
Revenues	24.8	39.2
Completion revenues
Segment Reporting Information [Line Items]
Revenues	49.9	86.4
Completion revenues | Southwest
Segment Reporting Information [Line Items]
Revenues	16.0	40.6
Completion revenues | Rocky Mountains
Segment Reporting Information [Line Items]
Revenues	19.8	27.5
Completion revenues | Northeast/Mid-Con
Segment Reporting Information [Line Items]
Revenues	14.1	18.3
Intervention revenues
Segment Reporting Information [Line Items]
Revenues	19.0	29.4
Intervention revenues | Southwest
Segment Reporting Information [Line Items]
Revenues	5.5	10.2
Intervention revenues | Rocky Mountains
Segment Reporting Information [Line Items]
Revenues	6.5	10.6
Intervention revenues | Northeast/Mid-Con
Segment Reporting Information [Line Items]
Revenues	7.0	8.6
Production revenues
Segment Reporting Information [Line Items]
Revenues	14.1	30.0
Production revenues | Southwest
Segment Reporting Information [Line Items]
Revenues	2.9	7.2
Production revenues | Rocky Mountains
Segment Reporting Information [Line Items]
Revenues	7.5	10.5
Production revenues | Northeast/Mid-Con
Segment Reporting Information [Line Items]
Revenues	$ 3.7	$ 12.3