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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, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Reconciliation of GAAP Net Income to Non-GAAP EBITDA and Adjusted EBITDA [Abstract]        
Net Income $ 35,443 $ 34,942 $ 83,757 $ 105,021
Interest Expense 6,309 5,346 19,173 11,750
Provision for Income Taxes 9,229 10,275 21,355 30,599
Depreciation and Amortization 43,681 39,833 128,538 119,656
Non-GAAP EBITDA 94,662 90,396 252,823 267,026
Restructuring and related charges (credits) 3,298 (348) 18,034 3,562
Foreign Exchange Transaction Losses 1,745 2,525 1,761 4,308
Interest and other income (4,232) (2,742) (9,602) (7,717)
Non-GAAP Adjusted EBITDA [1] $ 95,473 $ 89,831 $ 263,016 $ 267,179
[1] Adjusted EBITDA is Adjusted Contribution to Profit with depreciation and amortization added back.