Commitments and Contingent Liabilities (Narrative) (Details) - USD ($)	Aug. 18, 2014	May. 23, 2014	Jan. 30, 2016
Commitments and Contingencies
Future minimum payments due			$ 620,888,000
Amount of conditional bonuses that may be paid in 2016			500,000
Amount of conditional bonuses that may be paid in 2017			1,200,000
Term of purchase obligation		10 years
Chief Executive Officer
Commitments and Contingencies
Employment agreement contract term	3 years
Employment agreement, annual salary	$ 1,500,000
Equipment Leases
Commitments and Contingencies
Future minimum payments due			5,600,000
Loan Agreement
Commitments and Contingencies
Principal amount		$ 150,000,000.0	$ 150,000,000.0
Minimum
Commitments and Contingencies
Amount of guaranteed minimum product purchase commitment		240,000,000.0
Maximum
Commitments and Contingencies
Amount of guaranteed minimum product purchase commitment		$ 280,000,000.0