Represents the period after a change of control within which, if employment of the individual is either terminated without cause or due to resignation for good reason, the equity award will be fully vested, as defined under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

STOCK-BASED COMPENSATION - Three Year Vest Restricted Shares (Details) - Three-Year Vesting - USD ($) $ / shares in Units, $ in Millions								9 Months Ended
	Jan. 24, 2018	Aug. 04, 2017	Jan. 25, 2017	Jan. 27, 2016	Feb. 09, 2015	Jan. 28, 2015	Jan. 22, 2014	Sep. 30, 2018
Restricted Shares
Stock-based compensation
Vesting per year (as a percent)	33.00%		33.00%	33.00%			33.00%
Shares
Outstanding (in shares)								37,390
Granted (in shares)	17,712		17,451	21,100			14,500	17,712
Vested (in shares)								(18,883)
Forfeited (in shares)								(1,267)
Outstanding (in shares)								34,952
Weighted Average Fair Value
Outstanding (in dollars per share)								$ 51.39
Granted (in dollars per share								65.33
Vested (in dollars per share)								51.57
Forfeited (in dollars per share)								59.39
Outstanding (in dollars per share)								$ 57.92
Compensation cost
Unrecognized compensation cost								$ 1.4
Weighted average period of recognition of unrecognized compensation cost								1 year 10 months 24 days
Restricted Shares \| Certain employees, excluding Mr. Albright
Stock-based compensation
Vesting per year (as a percent)						33.00%
Shares
Granted (in shares)						11,700
Restricted Shares \| Mr. Albright
Stock-based compensation
Vesting per year (as a percent)					33.00%
Shares
Granted (in shares)					8,000
Equity Award Agreements
Award agreements
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation		24 months