| Component: (Network and Table) | |
|---|---|
| Network | 100320 - Disclosure - Product Warranty Liability (Tables) (http://www.graham-mfg.com/20160331/taxonomy/role/DisclosureProductWarrantyLiabilityTables) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0000716314 (http://www.sec.gov/CIK) |
| Guarantees [Abstract] | Period [Axis] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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2015-04-01 - 2016-03-31 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Guarantees [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reconciliation of the Changes in Product Warranty Liability | The reconciliation of the changes in the product warranty liability is as follows:
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