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Warranty - (Analysis of Changes in the Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Product Warranties Disclosures [Abstract]        
Balance at beginning of period $ 56,179 $ 49,689 $ 54,568 $ 50,602
Current period provisions 6,475 6,181 13,994 11,017
Costs incurred (7,227) (7,920) (13,175) (12,301)
Foreign currency translation adjustment (491) (217) (451) (1,585)
Balance at end of period $ 54,936 $ 47,733 $ 54,936 $ 47,733