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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 2) (Interest Rate Swap)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Swap
Derivative [Line Items]
Variable rate received	0.15%	0.19%	0.15%	0.19%
Fixed rate paid	0.94%	0.94%	0.94%	0.94%

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Namespace Prefix:	nick_
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Period Type:	duration

X

- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

Name:	nick_DerivativeAverageVariableInterestRateReceived
Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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