Note 11 - Stock-based Compensation - Changes in the Company's Stock Options (Details) shares in Thousands	6 Months Ended
	Aug. 26, 2017 $ / shares shares
Options outstanding, beginning of period (in shares) | shares	3,906
Options outstanding, weighted average exercise price, beginning of period (in dollars per share) | $ / shares	$ 56.48
Options granted (in shares) | shares	694
Options granted, weighted average exercise price (in dollars per share) | $ / shares	$ 37.50
Options exercised (in shares) | shares	(359)
Options exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 28.33
Options forfeited or expired (in shares) | shares
Options forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares
Options outstanding, end of period (in shares) | shares	4,241
Options outstanding, weighted average exercise price, end of period (in dollars per share) | $ / shares	$ 55.76
Options exercisable, end of period (in shares) | shares	2,447
Options exercisable, weighted average exercise price, end of period (in dollars per share) | $ / shares	$ 60.38