Gross margin30.5%33.6%33.7%35.3%34.7%29.4%
Gross margin growth (bps)-432-16-15765523499
Operating margin-8.5%-4.9%-2.9%2.2%2.0%-3.7%
Operating margin growth (bps)-636-197-518215751,368
Net profit margin-8.5%-4.7%-12.8%11.3%2.0%-3.7%
Net profit margin growth (bps)358813-2,4059265731,348

Notes:The company changed its fiscal year in 2011 from the end of February to the end of January; therefore, fiscal 2011 only includes 48 weeks of operations and Q4 2011 only includes 9 weeks of operations