Business Acquisition (Details 2) - Apr. 30, 2014 - Merck Sharpe & Dohme's API € in Thousands, $ in Thousands	EUR (€)	USD ($)
Business Acquisition
At Closing, April 2014	€ 13,252	$ 18,352
December 2014	4,899	5,989
December 2015	3,186	3,483
December 2016	3,186	3,475
December 2017	500	545
Total - estimated	€ 25,023	$ 31,844

- Definition

The payment of the purchase price at closing. Value is adjusted from original contractual amount to give effect to foreign exchange changes.

+ References

No definition available.

+ Details

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Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The payment of the purchase price in year four. Value is adjusted from original contractual amount to give effect to foreign exchange changes.

+ References

No definition available.

+ Details

Name:	amph_BusinessAcquisitionPaymentYearFour
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The payment of the purchase price in year one, excluding the payment made at closing. Value is adjusted from original contractual amount to give effect to foreign exchange changes.

+ References

No definition available.

+ Details

Name:	amph_BusinessAcquisitionPaymentYearOne
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The payment of the purchase price in year three. Value is adjusted from original contractual amount to give effect to foreign exchange changes.

+ References

No definition available.

+ Details

Name:	amph_BusinessAcquisitionPaymentYearThree
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The payment of the purchase price in year two. Value is adjusted from original contractual amount to give effect to foreign exchange changes.

+ References

No definition available.

+ Details

Name:	amph_BusinessAcquisitionPaymentYearTwo
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The estimated total payments for an acquisition. Value is adjusted from original contractual amount to give effect to foreign exchange changes.

+ References

No definition available.

+ Details

Name:	amph_BusinessAcquisitionTotalEstimatedPayments
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Details

Name:	us-gaap_BusinessAcquisitionAxis=amph_MerckSharpeAndDohmesAPIMember
Namespace Prefix:
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Period Type: