Stock-based compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			12 Months Ended	0 Months Ended	12 Months Ended		0 Months Ended		12 Months Ended
	Mar. 01, 2014	Mar. 02, 2013	Feb. 25, 2012	Mar. 01, 2014 Common stock	Oct. 31, 2013 2012 Equity Plan Outstanding stock options	Mar. 01, 2014 2012 Equity Plan Outstanding stock options	Oct. 16, 2013 2013 Equity Plan	Nov. 06, 2013 2013 Equity Plan Nonqualified stock options	Oct. 31, 2013 2013 Equity Plan Nonqualified stock options	Mar. 01, 2014 2013 Equity Plan Nonqualified stock options
Stock-based compensation
Awards modified for immediate vesting (in shares)					240,435
Stock-based compensation cost	$ 15,137	$ 283				$ 1,846				$ 13,291
Compensation expense related to the modification of outstanding stock options						1,594
Number of shares reserved for issuance							3,616,570
Awards granted (in shares)									2,622,721
Awards vested (in shares)								1,666,066
Vesting period of awards										7 years
Number of shares reserved for issuance			0
Unrecognized compensation cost (in dollars)	7,507
Average remaining service period for recognition of unrecognized compensation cost	3 years 8 months 12 days
Intrinsic value	342
Shares
Balance at beginning of year (in shares)	244,064
Granted (in shares)	2,622,721	245,387
Exercised (in shares)				(18,338)
Forfeited (in shares)	(20,745)	(1,323)
Expired (in shares)	(210)
Balance at end of year (in shares)	2,827,492	244,064
Exercisable at the end of the period (in shares)	1,887,679
Weighted-average exercise price
Balance at the beginning of the period (in dollars per share)	$ 17.01
Granted (in dollars per share)	$ 18.00	$ 17.01
Exercised (in dollars per share)	$ 17.54
Forfeited (in dollars per share)	$ 17.81	$ 17.01
Expired (in dollars per share)	$ 18.00
Balance at the end of the period (in dollars per share)	$ 17.92	$ 17.01
Exercisable at the end of the period (in dollars per share)	$ 17.88
Weighted-average contractual term remaining
Balance at end of year	9 years 6 months 22 days	9 years 3 months 22 days
Exercisable at the end of the period	9 years 6 months
Weighted average grant date fair value (in dollars per share)	$ 8.26	$ 8.60
Aggregate intrinsic value
Balance at the end of the period	50,587
Exercisable at the end of the period	$ 33,849
Weighted-average assumptions used to measure the grant date fair value of the non-qualified stock options granted under the 2013 Equity Plan using the Black Scholes option pricing model
Expected term	5 years 8 months 12 days	6 years 6 months
Expected volatility (as a percent)	48.28%	51.54%
Risk-free interest rate (as a percent)	1.49%	1.01%
Dividend yield (as a percent)	0.00%	0.00%