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Operating Leases, Total Net Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Net Lease Costs [Abstract]        
Operating lease cost $ 6,325 $ 6,611 $ 12,242 $ 13,246
Variable lease cost 397 730 741 1,251
Short-term lease cost 36 92 56 180
Sublease income (190) (175) (391) (345)
Total net lease cost [1] $ 6,568 $ 7,258 $ 12,648 $ 14,332
[1] Total net lease cost does not include those costs and sublease income included in Restructuring and related (credits) charges on our Unaudited Condensed Consolidated Statements of Net Income. This includes those operating leases we had identified in the year ended April 30, 2021 as part of our Business Optimization program that would be subleased. See Note 9, “Restructuring and Related (Credits) Charges” for more information on this program.