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Goodwill and Intangible Assets Goodwill Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill | $ 2,322,928 | $ 2,433,784 | $ 2,231,303
Goodwill, Transfers |  | 0 |
Life Science Member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Transfers |  | 0 |
Healthcare Specialty Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Transfers |  | (1,855) |
Healthcare Products [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Transfers |  | 0 |
Applied Sterilization Technologies [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Transfers |  | 1,855 |
goodwill acquired or allocated member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | 3,232 | 35,766 |
Foreign Currency Gain (Loss) [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | (114,088) | 166,715 |
Healthcare Specialty Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 374,910 | 388,025 | 375,879
Healthcare Specialty Services [Member] | goodwill acquired or allocated member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | (907) | 3,501 |
Healthcare Specialty Services [Member] | Foreign Currency Gain (Loss) [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | (12,208) | 10,500 |
Life Science Member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 147,795 | 148,816 | 146,514
Life Science Member [Member] | goodwill acquired or allocated member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | 0 | 0 |
Life Science Member [Member] | Foreign Currency Gain (Loss) [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | (1,021) | 2,302 |
Healthcare Products [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 397,284 | 404,674 | 377,765
Healthcare Products [Member] | goodwill acquired or allocated member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | (1,202) | 16,418 |
Healthcare Products [Member] | Foreign Currency Gain (Loss) [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | (6,188) | 10,491 |
Applied Sterilization Technologies [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 1,402,939 | 1,492,269 | $ 1,331,145
Applied Sterilization Technologies [Member] | goodwill acquired or allocated member [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | 5,341 | 15,847 |
Applied Sterilization Technologies [Member] | Foreign Currency Gain (Loss) [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ (94,671) | $ 143,422 |

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