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Schedule of Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2016 | Apr. 30, 2016 | Apr. 30, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 4.1 |  |  | $ 5.2 |  | $ 12.6 | $ 5.8
2016 First Quarter Actions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 |  |  | 0.0 |  | 12.6 | 0.0
2015 Actions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.0 |  |  | 5.2 |  | 2.3 | 5.8
Cost of sales |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0.8 |  |  | 2.5 |  | 4.9 | 3.2
Operating expenses |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 3.3 |  |  | 2.7 |  | 7.7 | 2.6
One-time Termination Benefits | 2016 First Quarter Actions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | $ 4.1 | $ 0.4 | $ 5.8 | $ 0.0 | $ 6.2 | $ 4.1 | $ 0.0

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