SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 483.4	$ 468.6	$ 940.8	$ 874.5
Adjusted EBITDA	94.2	98.0	176.7	157.0
Depreciation and amortization	34.3	27.0	61.9	53.5
Capital expenditures	40.2	30.9	99.2	95.1
Operating Segments | DPS
Segment Reporting Information [Line Items]
Revenues	297.2	287.4	572.4	545.9
Adjusted EBITDA	77.4	72.7	138.8	127.8
Depreciation and amortization	15.4	14.9	30.7	29.7
Capital expenditures	19.5	11.7	56.4	56.7
Operating Segments | PDS
Segment Reporting Information [Line Items]
Revenues	57.8	53.4	110.1	101.9
Adjusted EBITDA	18.4	16.7	34.7	30.5
Depreciation and amortization	1.9	1.3	3.7	2.5
Capital expenditures	1.7	5.9	3.1	15.6
Operating Segments | DSS
Segment Reporting Information [Line Items]
Revenues	129.2	127.9	259.1	226.8
Adjusted EBITDA	26.1	30.8	58.1	45.6
Depreciation and amortization	16.1	10.2	25.8	20.1
Capital expenditures	11.6	9.0	29.5	16.3
Other | Other
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	0.0	0.0
Adjusted EBITDA	(27.5)	(22.2)	(54.7)	(46.9)
Depreciation and amortization	0.9	0.6	1.7	1.2
Capital expenditures	7.4	4.3	10.2	6.5
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(0.8)	$ (0.1)	(0.8)	$ (0.1)
Adjusted EBITDA	$ (0.2)		$ (0.2)