Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_DebtInstrumentAxis=ncs_PriorToJanuary152018Member
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_DebtInstrumentAxis=ncs_SeniorNotesdueJanuary2023Member
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LONG-TERM DEBT AND NOTE PAYABLE - Senior Notes (Details) - USD ($)	6 Months Ended	12 Months Ended
	May. 01, 2016	Jan. 14, 2022	Jan. 14, 2021	Jan. 14, 2020	Jan. 14, 2019	Nov. 01, 2015
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	108.25%
Scenario, Forecast [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		100.00%	102.063%	104.125%	106.188%
Maximum [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed	40.00%
Prior to January 15, 2018 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Senior Notes due January 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.25%
Debt instrument, face amount	$ 250,000,000
Senior Notes due January 2023 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.25%					8.25%