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Restructuring Charges (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | Jan. 31, 2016 | Jan. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges | $ 4,100,000 |  |  | $ 5,200,000 |  | $ 12,600,000 | $ 5,800,000 |  |
2016 First Quarter Actions |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges | 0 |  |  | 0 |  | 12,600,000 | 0 |  |
2016 First Quarter Actions | Engine Product segment |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring reserve |  |  | $ 0 |  |  |  |  |  |
2015 Actions |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges | 0 |  |  | 5,200,000 |  | 2,300,000 | 5,800,000 |  |
2015 Actions | Engine Product segment |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Expected restructuring costs |  |  |  |  |  |  |  |  | $ 5,800,000
Restructuring charges |  |  |  |  |  |  |  | $ 5,800,000 |
One-time Termination Benefits | 2016 First Quarter Actions |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Expected restructuring costs | 5,500,000 |  | 7,200,000 |  |  | 5,500,000 |  |  |
Restructuring charges | 4,100,000 | $ 400,000 | $ 5,800,000 | $ 0 | $ 6,200,000 | 4,100,000 | $ 0 |  |
One-time Termination Benefits | 2016 First Quarter Actions | Engine Product segment |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges | 1,100,000 |  |  |  |  | 7,200,000 |  |  |
One-time Termination Benefits | 2016 First Quarter Actions | Industrial Product segment |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges | $ 3,000,000 |  |  |  |  | $ 5,400,000 |  |  |

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