XML 64 R47.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Interest Rate Swap Agreements - Summary of locations and amounts of losses in income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Periodic change in fair value of interest rate swap agreements | $ 222 | $ (24) | $ (364)
Periodic settlement differentials included in interest expense | (179) | (343) |
Gain (loss) recognized in income | $ 43 | $ (367) |

X
- Definition Amount of periodic settlement differentials included in interest expense. + References No definition available. + Details
Name: | nick_PeriodicSettlementsIncludedInInterestExpense
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents pre tax income (loss) gain recognized in income. + References No definition available. + Details
Name: | nick_PreTaxIncomeLossGainRecognizedInIncome
Namespace Prefix: | nick_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
Name: | us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration