Equity Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	Mar. 03, 2015	Mar. 04, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	May. 22, 2013
Assumptions used to value the stock options granted
Expected term			2 years 9 months 29 days	2 years 9 months 29 days
Expected volatility (as a percent)			25.51%	32.98%
Risk-free rate (as a percent)			1.02%	0.64%
2010 Plan
Equity Incentive Plan
Shares of common stock that were available for issuance pursuant to the 2010 Plan			3,341,238		3,341,238		6,000,000
Stock Options
Number of Shares Subject to Options
Options outstanding at the beginning of the period (in shares)					758,095
Exercised (in shares)					(87,896)
Forfeited (in shares)					(3,968)
Expired (in shares)					(282)
Options outstanding at the end of the period (in shares)			665,949		665,949
Weighted Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)					$ 20.94
Exercised (in dollars per share)					17.41
Forfeited (in dollars per share)					25.94
Expired (in dollars per share)					15.23
Options outstanding at the end of the period (in dollars per share)			$ 21.38		$ 21.38
Number of Shares Subject to Options
Unvested balance at the beginning of the period (in shares)					283,964
Forfeited (in shares)					(3,968)
Vested (in shares)					(163,392)
Unvested balance at the end of the period (in shares)			116,604		116,604
Weighted Average Fair Value at Grant
Unvested balance at the beginning of the period (in dollars per share)					$ 7.75
Forfeited (in dollars per share)					8.05
Vested (in dollars per share)					6.82
Unvested balance at the end of the period (in dollars per share)			$ 9.03		$ 9.03
Compensation cost not yet recognized
Unearned compensation			$ 0.8		$ 0.8
Stock Options | Weighted Average
Compensation cost not yet recognized
Vesting period					1 year 4 months 24 days
Restricted Awards
Restricted Awards
Unvested balance at the beginning of the period (in shares)					394,016
Granted (in shares)					183,710
Forfeited (in shares)					(22,145)
Vested (in shares)					(158,815)
Unvested balance at the end of the period (in shares)			396,766		396,766
Weighted Average Fair Value at Grant
Unvested balance at the beginning of the period (in dollars per share)					$ 29.10
Granted (in dollars per share)					47.39
Forfeited (in dollars per share)					34.54
Vested (in dollars per share)					26.76
Unvested balance at the end of the period (in dollars per share)			$ 38.20		$ 38.20
Compensation cost not yet recognized
Unearned compensation			$ 13.3		$ 13.3
Restricted Awards | Weighted Average
Compensation cost not yet recognized
Vesting period					2 years 8 months 12 days
Restricted stock
Restricted Awards
Grant date value					$ 8.4
Granted (in shares)					176,582
RSUs
Restricted Awards
Granted (in shares)					7,128
PSAs
Restricted Awards
Grant date value	$ 2.7	$ 1.6
Granted (in shares)	78,553	91,335
Forfeited (in shares)					(3,637)	(3,782)
Compensation cost not yet recognized
Unearned compensation			$ 3.1		$ 3.1
Percentage of awards eligible to be earned upon TSR achievement in year one of the performance period					20.00%
Percentage of awards eligible to be earned upon TSR achievement in year two of the performance period					20.00%
Percentage of awards earned upon TSR achievement in year three of the performance period					20.00%
Percentage of awards eligible to be earned upon cumulative TSR achievement over the three-year performance period					40.00%
Number of awards failed to satisfy performance condition						6,872
PSAs | Weighted Average
Compensation cost not yet recognized
Vesting period					2 years 6 months
PSAs | Minimum
Compensation cost not yet recognized
Percentage of number of shares to be earned under awards	25.00%	0.00%
PSAs | Maximum
Compensation cost not yet recognized
Percentage of number of shares to be earned under awards	175.00%	150.00%