ACQUISITIONS (Fair Values and Useful Lives of Intangible Assets Acquired) (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Nov. 01, 2018	Mar. 15, 2018
Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount			$ 14,450
Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		$ 6,882
test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount	$ 6,219
Customer relationships | Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			6 years 6 months
Finite-lived intangible assets acquired, amount			$ 5,800
Customer relationships | Think
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)		7 years
Finite-lived intangible assets acquired, amount		$ 6,117
Customer relationships | test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	7 years
Finite-lived intangible assets acquired, amount	$ 2,456
Favorable lease | Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			11 years 2 months 12 days
Finite-lived intangible assets acquired, amount			$ 5,500
Favorable lease | Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		0
Favorable lease | test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount	$ 0
Software | Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount			$ 0
Software | Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		0
Software | test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	6 years
Finite-lived intangible assets acquired, amount	$ 3,461
Contract royalties | Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			8 years
Finite-lived intangible assets acquired, amount			$ 1,900
Contract royalties | Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		$ 0
Contract royalties | test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount	$ 0
Trade names | Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			5 years
Finite-lived intangible assets acquired, amount			$ 1,250
Trade names | Think
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)		5 years
Finite-lived intangible assets acquired, amount		$ 765
Trade names | test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	4 years
Finite-lived intangible assets acquired, amount	$ 302