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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
May 31, 2018
Feb. 28, 2018
May 31, 2017
Feb. 28, 2017
Product Warranty Liability [Line Items]                
Standard Product Warranty Accrual $ 4,855 $ 5,966 $ 4,855 $ 5,966 $ 4,925 $ 6,233 $ 5,927 $ 5,608
Standard Product Warranty Accrual, Additions from Business Acquisition 0 0 0 500        
Standard Product Warranty Accrual, Increase for Warranties Issued 1,366 2,077 2,866 4,109        
Standard Product Warranty Accrual, Period Increase (Decrease) 0 0 (832) 0        
Standard Product Warranty Accrual, Decrease for Payments $ (1,436) $ (2,038) $ (3,412) $ (4,251)