Basis of Presentation and Summary of Significant Accounting Policies - Cash (Details) - USD ($)	6 Months Ended	12 Months Ended
Jul. 28, 2017	Jan. 27, 2017
Cash
Number of business days within which the majority of payments are due for the settlement of debit and credit card transactions	3 days
Book overdrafts included in accounts payable	$ 7,900,000	$ 7,000,000
Maximum
Cash
FDIC Insured amount	$ 250,000

Represents the number of business days within which the majority of payments are due from financial institutions for the settlement of debit and credit card transactions processed.

No definition available.

Name:	ncso_NumberOfBusinessDaysForProcessingOfPaymentsDueFromFinancialInstitutionsForSettlementOfDebitOrCreditCardTransactions
Namespace Prefix:	ncso_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration