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REVENUE RECOGNITION (Narrative) (Details) - USD ($) $ in Millions | Jan. 31, 2021 | Apr. 30, 2020 | Jan. 31, 2020 | Apr. 30, 2019
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Disaggregation of Revenue [Line Items] |  |  |  |
Deferred revenue | $ 18.7 |  |  |
POM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Deferred revenue | 135.1 |  |  |
Current deferred revenue | 94.2 |  |  |
TIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Current deferred revenue | $ 20.4 | $ 30.8 | $ 21.2 | $ 29.7

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