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Operating Leases, Total Net Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Net Lease Costs [Abstract]        
Operating lease cost $ 6,611 $ 6,199 $ 13,246 $ 13,060
Variable lease cost 730 915 1,251 2,118
Short-term lease cost 92 0 180 0
Sublease income (175) 184 (345) (339)
Total net lease cost [1] $ 7,258 $ 7,298 $ 14,332 $ 14,839
[1] Total net lease cost does not include those costs included in Restructuring and Related Charges on our Unaudited Condensed Consolidated Statements of Income. See Note 9, “Restructuring and Related Charges” for more information on these programs.