Note 9 - Changes in the Company's Stock Options (Details) - Employee Stock Option [Member]	6 Months Ended
	Aug. 27, 2016 $ / shares shares
Options outstanding, beginning of period (in shares) | shares	3,838,000
Options outstanding, beginning of period (in dollars per share) | $ / shares	$ 54.43
Granted (in shares) | shares	703,000
Granted (in dollars per share) | $ / shares	$ 45.53
Exercised (in shares) | shares	(635,000)
Exercised (in dollars per share) | $ / shares	$ 31.94
Forfeited or expired (in shares) | shares	0
Forfeited or expired (in dollars per share) | $ / shares	$ 0
Options outstanding, end of period (in shares) | shares	3,906,000
Options outstanding, end of period (in dollars per share) | $ / shares	$ 56.48
Options exercisable, end of period (in shares) | shares	2,262,000
Options exercisable, end of period (in dollars per share) | $ / shares	$ 55.02