Note 2 - Fair Value Measurements (Details) - Valuation of the Company’s Financial Assets Measured at Fair Value on a Recurring Basis by Input Level (USD $) In Millions, unless otherwise specified	Jun. 01, 2013	Mar. 02, 2013
Long term - available-for-sale securities:
Auction rate securities	$ 48.6	$ 49.0
Long term - trading securities:
Nonqualified deferred compensation plan assets	32.2	28.3
Auction Rate Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Long term - available-for-sale securities:
Auction rate securities	48.6	49.0
Auction Rate Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Long term - available-for-sale securities:
Auction rate securities	48.6	49.0
Auction Rate Securities [Member]
Long term - available-for-sale securities:
Auction rate securities	48.6	49.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Long term - trading securities:
Nonqualified deferred compensation plan assets	32.2	28.3
Total	32.2	28.3
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Long term - trading securities:
Total	48.6	49.0
Fair Value, Measurements, Recurring [Member]
Long term - trading securities:
Nonqualified deferred compensation plan assets	32.2	28.3
Total	$ 80.8	$ 77.3

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- Definition

Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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