The interest rate range for debt instruments reported on the Schedule of Investments.

No definition available.

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- Definition

The highest interest rate in the aggregated short-term debt instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Footnote 2

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- Definition

The lowest interest rate in the aggregated short-term debt instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Footnote 2

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- Definition

Description of the interest rate as being fixed, variable, stepped, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- Definition

Available-for-Sale Securities, Maturities [Abstract]

+ References

No definition available.

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- Definition

The percentage of available-for-sale securities having maturity dates during or subsequent to the fourth fiscal year after the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

+ References

No definition available.

+ Details

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- Definition

The percentage of available-for-sale securities having maturity dates within one fiscal year from the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

+ References

No definition available.

+ Details

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- Definition

The percentage of available-for-sale securities having maturity dates within the third fiscal year after the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

+ References

No definition available.

+ Details

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- Definition

The percentage of available-for-sale securities having maturity dates within the second fiscal year after the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

+ References

No definition available.

+ Details

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- Definition

The face amount of the securities; generally not indicative of the fair market value.

+ References

No definition available.

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- Definition

The estimated reduction in the fair value of an investment as a result of a one hundred basis point increase in the discount rate used to calculate the investment's fair value.

+ References

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ 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=51813488&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

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- Definition

Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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Fair Value Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Fair Value Narrative (Details) - USD ($) $ in Millions	Feb. 24, 2017	Feb. 26, 2016	Feb. 27, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized gain (loss) on investments	$ (1.4)	$ (0.2)	$ 0.0
Managed Investment Portfolio and Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	73.4	84.1
Unrealized gain (loss) on investments	$ 0.1	0.0
Available-for-Sale Securities, Maturities [Abstract]
Available-for-sale Securities, Maturities within One Year, Fair Value	57.00%
Available-for-sale Securities, Maturities within Two Years, Fair Value	10.00%
Available-for-sale Securities, Maturities within Three Years, Fair Value	10.00%
Available-for-sale Securities, Maturities within Four or More Years, Fair Value	23.00%
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized gain (loss) on investments	$ 0.5
Available-for-sale Securities, Par Value	6.5
Other than Temporary Impairment Losses, Investments	$ 2.5
Investment Interest Rate Range [Abstract]
Investment Interest Rate Type	30-Day LIBOR
Investment Interest Rate Range Start	2.00%
Investment Interest Rate Range End	2.50%
Available-for-Sale Securities, Maturities [Abstract]
Estimated Reduction in Fair Value due to a One Hundred Basis Point Increase in Discount Rate	$ 0.4
Fair Value, Measurements, Recurring [Member] \| Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	3.5	4.4
Fair Value, Measurements, Recurring [Member] \| CanadianAssetBackedCommercialPaperRestructuringNotes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure		3.1
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		5.2
Available-for-sale Securities, Fair Value Disclosure	$ 3.5	4.4	$ 9.7
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| CanadianAssetBackedCommercialPaperRestructuringNotes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure		$ 0.0