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Segment and Geographic Information - Geographic information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
GEOGRAPHIC INFORMATION                      
Sales revenue, net $ 390,847 $ 423,709 $ 347,205 $ 327,986 $ 347,369 $ 412,251 $ 335,058 $ 311,998 $ 1,489,747 $ 1,406,676 $ 1,392,575
Long-lived assets 1,066,008       1,067,891       1,066,008 1,067,891 894,577
United States                      
GEOGRAPHIC INFORMATION                      
Sales revenue, net                 1,168,888 1,111,109 1,080,338
Long-lived assets 437,920       409,337       437,920 409,337 407,621
International                      
GEOGRAPHIC INFORMATION                      
Sales revenue, net                 320,859 295,567 312,237
Long-lived assets 628,088       658,554       628,088 658,554 486,956
Barbados                      
GEOGRAPHIC INFORMATION                      
Long-lived assets 496,258       499,064       496,258 499,064 315,182
Other international                      
GEOGRAPHIC INFORMATION                      
Long-lived assets $ 131,830       $ 159,490       $ 131,830 $ 159,490 $ 171,774