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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 1) - Interest rate swap	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Derivative [Line Items]
Variable rate received	1.22%	1.05%
Fixed rate paid	0.87%	0.91%

X

- Definition

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

+ References

No definition available.

+ Details

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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

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Data Type:	num:percentItemType
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- 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

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X

- Details

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