Commitments and Contingencies Gain Contingency (Details) - Positive Outcome of Litigation [Member] $ in Thousands	Jul. 31, 2018 USD ($)
September 29, 2016 [Member] | Trademark Infringement Award, Profits [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	$ 5,500
October 5, 2016 [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	13,750
October 5, 2016 [Member] | Trademark Infringement Award, Punitive Damages [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	8,250
August 14, 2017 [Member] | Trademark Infringement Award, Profits [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	11,100
August 14, 2017 [Member] | Trademark Infringement Award, Punitive Damages [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	8,250
August 24, 2017 [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	$ 21,000