Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)	12 Months Ended
Feb. 25, 2017	Feb. 27, 2016	Feb. 28, 2015
Income Tax Disclosure [Abstract]
Tax at statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	4.10%	0.70%	2.00%
Tax contingencies	(0.70%)	0.00%	(0.30%)
Research and development tax credits	(0.60%)	(4.40%)	(0.00%)
Benefit of worthless stock deduction	0.00%	0.00%	(3.20%)
Retired executive officer’s compensation	(2.90%)	0.00%	0.00%
Other	(0.10%)	0.60%	0.20%
Effective income tax rate, continuing operations	34.80%	31.90%	33.70%

Effective Income Tax Rate Reconciliation, Worthless Stock Deduction

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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