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Summary of Significant Accounting Policies (Inventories) (Details)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Inventory [Line Items]
Percentage of weighted average cost inventory	34.00%	55.00%
Minimum
Inventory [Line Items]
Purchase order commitment period	30 days
Maximum
Inventory [Line Items]
Purchase order commitment period	180 days

X

- Definition

Purchase Order Commitment Period

+ References

No definition available.

+ Details

Name:	asys_PurchaseOrderCommitmentPeriod
Namespace Prefix:	asys_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Definition

The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

+ References

No definition available.

+ Details

Name:	us-gaap_PercentageOfWeightedAverageCostInventory
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: