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Segment Information, Reconciliation of GAAP Net Income to Non-GAAP EBITDA and Adjusted EBITDA (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Reconciliation of GAAP Net Income to Non-GAAP EBITDA and Adjusted EBITDA [Abstract]        
Net Income $ 22,161 $ 35,443 $ 106,927 $ 83,757
Interest expense 4,853 6,309 13,928 19,173
Provision for income taxes 5,231 9,229 18,712 21,355
Depreciation and amortization 49,316 43,681 147,253 128,538
Non-GAAP EBITDA 81,561 94,662 286,820 252,823
Restructuring and related charges 20,675 3,298 24,813 18,034
Foreign exchange transaction losses 5,694 1,745 6,473 1,761
Other income (3,612) (4,232) (11,769) (9,602)
Non-GAAP Adjusted EBITDA [1] $ 104,318 $ 95,473 $ 306,337 $ 263,016
[1] Adjusted EBITDA is calculated as Adjusted Contribution to Profit with depreciation and amortization added back.