Stock-Based Compensation - Changes in the Company's Stock Options (Details) shares in Thousands	6 Months Ended
	Aug. 31, 2019 $ / shares shares
Number of Stock Options
Options outstanding, beginning of period, Number of Stock Options (in shares) | shares	4,395
Granted, Number of Stock Options (in shares) | shares	144
Exercised, Number of Stock Options (in shares) | shares	0
Forfeited or expired, Number of Stock Options (in shares) | shares	(2,607)
Options outstanding, end of period, Number of Stock Options (in shares) | shares	1,932
Options exercisable, end of period, Number of Stock Options (in shares) | shares	1,094
Weighted Average Exercise Price
Options outstanding, beginning of period, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 47.53
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares	15.68
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	0
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares	53.86
Options outstanding, end of period, Weighted Average Exercise Price (in dollars per share) | $ / shares	36.62
Options exercisable, end of period, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 45.83