Indebtedness - Actual and Required Covenant Levels Under Existing Agreements (Detail)	Jan. 31, 2013	Jan. 31, 2012
Debt Instrument [Line Items]
Minimum fixed charge coverage ratio, Required	1.50	1.50
Maximum leverage ratio, Required	3.00	3.00
Fixed charge coverage ratio, Actual	2.57	2.98
Leverage ratio, Actual	1.99	0.78

The ratio of total funded indebtedness to adjusted EBITDA. Total funded indebtedness consists of outstanding debt, capital leases, asset retirement obligations and escrow liabilities.

No definition available.

Name:	layn_LeverageRatio
Namespace Prefix:	layn_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant